Music critics gave "I'll Be Lovin' U Long Time" generally favorable reviews, with many citing it as the album's standout track.

[7] E=MC² was hailed as one of the most anticipated albums of 2008, with many critics weighing their opinions on whether Carey would be able to deliver significant success, following her achievements with The Emancipation of Mimi.

[9] "Touch My Body" experiences strong commercial success, becoming Carey's eighteenth chart-topping single on the Billboard Hot 100, as well as placing within the top-five in several European countries.

[17] Though receiving praise from music critics, and strong speculation that it would become another worldwide hit for Carey,[18][19] the song stalled at number nineteen on the Hot 100, and achieved weak international charting.

[20] Subsequently, Carey's label, Island Records, decided to release an up-tempo and dance-able number that would be easily a "summer hit".

[24][25] The song's title is derived from the popular line, "me love you long time", from the 1987 war film, Full Metal Jacket.

Critics also noted how "I'll Be Lovin' U Long Time" "recalls" the melody riff[28] and chord progression[24] of the Hill Street Blues's theme song.

[30] The song was written by Carey, Aldrin Davis, Crystal Johnson and Clifford Harris, and features Mark DeBarge and Etterlene Jordan on the songwriting credits, due to the inclusion of the samples.

[32] In the film Full Metal Jacket, an Asian prostitute approaches US troops and offers to engage in lewd conduct in exchange for money.

One hundred percent feel-good and packing in a killer breakdown and conclusion that’s a wall of Mariah voices, this was the first song that felt like the work of unstoppable pop genius."

Chuck Taylor of Billboard assured the song would endure strong success and radio appeal, and complimented its overall production, as well as Carey's voice: "[It's] a playful, beach-befitting groove, featuring a bright sample from DeBarge's "Stay With Me," lushly woven vocals and Carey's highs doting on fans with her sonic signature.

"[34] The Republican's Kevin O'Hare claimed the song would be "destined for hits-ville",[35] while Jennifer Vineyard from MTV News described it as a "joyful romp".

[36] Similarly, the song was described as a "party jam" by Julien Bittencourt from The Day,[37] and "a fun, flirty tease" from Foster's Daily Democrat's Nekesa Mumbi Moody.

[39] Digital Spy's Nick Levine called "I'll Be Lovin' U Long Time" a "safe-but-classy number",[22] while aside from an "unfortunate title and chorus", Gregg Shapiro of Bay Area Reporter said it "virtually glows".

[40] In a separate review for the song, Levine rated it three out of five stars, and wrote "in spite of its predictability, 'I'll Be Lovin' U Long Time' still makes for a satisfying listen, sounding classy, effortless and as summery as a glass of rosé in the garden after a work.

"[41] Journalist for the Norwegian Broadcasting Corporation (NRK), Svein Terje Torvik described the song as "One of the album's best cuts",[42] while Fox News blogger Roger Friedman wrote "its just enough of a new twist to create the most elusive thing of all: a radio smash.

[43] Allmusic critic Stephen Thomas Erlewine chose the song as one of his "top picks" from E=MC², and wrote "it has a lightness that so much of the album lacks.

"[45] Margeauz Watsman from Entertainment Weekly called the song a "dance-floor anthem",[46] while PopMatters Evan Sawdey described it as "certainly worthy of some greatest-hits canonization".

[47] Slant Magazine editor Sal Cinquemani felt "I'll Be Lovin' U Long Time" was a "stroke of genius", and wrote "[It] sounds like a hyperventilating cross between a graduation anthem and an early-'80s family sitcom theme song.

The remix was produced by Carey and DJ Toomp, and was released for digital download on July 1, 2008, the same day as the original version of the song.

By the second verse, Carey, now in a black bikini, is shown at the bottom of a ravine by the beach staring at the sun, then altering to scenes of the party once more.

's verse starts, he's shown behind a waterfall, in the midst of shrubbery outside, where Mariah then appears sitting in a large body of clear water with golden sand.

[62] On July 31, 2008, Carey performed a free concert at the Hollywood and Highland Center shopping mall in Los Angeles, California in front of over 5,000 fans.