Your New Boyfriend Wears Girl Pants by Zebrahead is a punk rock song that humorously addresses the feelings of jealousy and frustration experienced by the narrator over a past relationship. The song conveys themes of lost love, insecurity, and rivalry, as the protagonist mocks his ex-girlfriend's new boyfriend, who he perceives as unmanly or effeminate, as indicated by his choice of attire. The lyrics are laced with sarcastic and self-deprecating humor, reflecting the band’s signature style. Notable moments in the song include the protagonist’s biting remarks and his ultimate realization of how ridiculous his jealousy seems, which underscores the song's satirical take on the typical breakup narrative.