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1.
A gaping vagina that makes deep bass-like noises.
How was sex with that chick last night?
Great, up until I heard her Vaginal Tuba.
by Brian & Nick April 19, 2009
 
2.
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.
by Bighusker3511 June 15, 2009