Background and release
An 18-second sample of the introduction of "Lips Are Movin", where Trainor sings in a half-sung, half-rapped format and retro-soul melody over a percussion-heavy arrangement.
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"Lips Are Movin" is a bubblegum pop, doo-wop and R&B song. It includes half-sung, half-rapped vocals and a retro-soul melody with beats and a percussion-heavy arrangement. VH1 described it as "a feisty, upbeat track" that "has some spunky lyrics". According to James Cowan of Canadian Business, the song "shares the same girl-group-influenced harmonies, wry lyrics and candy palette" of its predecessor, "All About That Bass". Musically, "Lips Are Movin" was likened to Christina Aguilera's "Candyman" (2007) by Carl Smith of Sugarscape.com. The song's tempo is 139 beats per minute. It is composed in the key G major. Trainor's vocals span the tonal nodes F3 to B5. The song's chord progression is G–Am–C–G.
Kevin Kadish produced and co-wrote "Lips Are Movin".
The song's lyrics are about a philandering, untruthful man; they include, "if your lips are movin', then you're lyin', lyin', lyin, babe". It was reportedly written in eight minutes by Kevin Kadish and Meghan Trainor and produced by the former.
On October 14, 2014, the song's artwork and a full-length low-quality version were leaked online. The same day, it was announced by the label that "Lips Are Movin" would be released to contemporary hit radio in the US on October 21, 2014, as Trainor's second single. The song was offered first on Shazam, and also premiered on MTV News the following day. The song garnered radio play from three radio stations the same day, six days before its radio release date. The song was released as a download on the same date in Austria, Germany, and Switzerland. It was later released worldwide—except in the United Kingdom—instantly made available to those who pre-ordered Title, In the United Kingdom, the song was released as a download on January 18, 2015.