After being used in an ad for Levi's, it achieved commercial success in many countries, including Ireland, UK, Sweden, New Zealand, and Australia, where it topped the singles charts.

In Europe, the song entered the top 5 also in Austria (2), Belgium (4), Denmark (2), Finland (2), Germany (2), Iceland (4), the Netherlands (4), Norway (2), Spain (3), and Switzerland (3).

[11] A reviewer from Music Week gave the track four out of five, stating that being used in the latest Levi's ad, it's "guaranteeing the Shagster another UK smash with this slo-mo pop ragga which samples Marvin Gaye's "Let's Get It On".

"[15] A reviewer from People Magazine opined that the album "is more like the real reggae thing", and "the raw title song is the style's most uncompromising Top 10 trip yet.

[17] Al Weisel from Rolling Stone viewed it as "a stripped-down dub masterpiece, a percussive cacophony of samples, sound effects and a clanging piano.

Shaggy's baritone growl oozes a sexuality that recalls both the dance-hall swagger of Shabba Ranks and theatrical self-deprecation of ska king Prince Buster.

[19] David Sinclair from The Times described it as "an entertaining tribute to the singer's boundless sex appeal", noting Shaggy's "mischievous glee, the Rs rolling off his tongue like the purr of a big cat."

He added, "Set to a plonking, one-note piano riff and minimalist reggae beat, "Boombastic" is one of those feelgood dance records that seems to conjure a special magic out of thin air.

[21] Tom Ewing of Freaky Trigger said the musician is "the benevolent monarch of this world, giving a comical, flirtatious, crowd-tickling performance, his army of mechanical instruments dancing in and out of his phrasing.