It was released through Artist Partner Group on February 7, 2024, as the lead single from her debut studio album, After 7 (2024).

Atia Boggs and Johnny Goldstein co-wrote the R&B and synth-pop song with hip hop and dance elements, in which Bankz sings and raps over a Philly club-inspired beat about asking a lover with a girlfriend to tell her about their affair.

Before releasing "Tell Ur Girlfriend", rapper Lay Bankz released her first single through Artist Partner Group, "Left Cheek (Doo Doo Blick)", in 2022; her debut extended play (EP), Now You See Me, in August 2023; and her single "Ick", which was used in over 200 thousand videos on TikTok by 2024.

[7] "Tell Ur Girlfriend" is a melodic song with a Philly club-inspired beat, "stuttering" synths, vocal samples, which incorporates 1990s R&B and synth-pop with elements of rap and dance music.

[14] Uproxx's Wongo Okon called it "a single that is wildly infectious and begs for a few listens before moving on to something else.

"[15] Vincent Lane of The Garnette Report said it added "layers of serrated synths and space-age squelches of turn-of-the-millennium R&B atop the sliding 808s of drill and insistent five-beat pattern of East Coast Club to create a futuristic, dancefloor-filling anthem.