A master of sexy-time underwear maybe, but Andrew Christian also has another persona — as a 1990s rap star. Why else would the undies line produce videos of greased-up babes popping (and punching) their booties for the camera? In the NSFW video after the jump, I half expect the song “Punch That Kitty” by Glamorous Monique and Gordy Cox to break into, “I like big butts and I cannot lie…”