Completely covering a vagina up with your entire mouth while blowing in air. Quickly before the air can escape, push down down on her stomach creating a tuba like sound.
Dre missed being in the band so he gave his girlfriend the 'ol vaginal tuba to re-live some highschool memories.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi