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2.
a fully erect penis. colloquial term for male genitalia in an erect state.
Sally was disapointed by Ted's flacid flesh balloon.

by jafus December 07, 2005
 
1.
A term use to describe the testicles of a man
Hey thats some mighty fine juice you got in the old flesh balloon.
by Ruffun September 08, 2008