The song, a playful and suggestive tune, was often referred to having something related to sexual themes. Bainbridge stated that "(Any sexuality on "Mouth" was) not deliberate—it was definitely not a sexual song. It's just honest—about a relationship, how you feel in a relationship.
The song, with its light-hearted and suggestive quality, was often connected to sexual themes. Bainbridge indicated that "(Any sexuality in 'Mouth' was) not deliberate—it definitely wasn't a sexually themed track. It's purely genuine—about a connection, how one feels within a relationship."