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an unerect penis, or any other type of floppy material
ohhhhhhh flumpus.

one time he slapped her with his flumpus and she cried.
by p-mo May 14, 2006
A vaginal fart, typically occuring during intercourse.
I was chewing her box when she let out a flumpus that parted my hair.
by joebob296 January 06, 2006
An idiot, lil bro that u want to beat the living shat out of all the time.
the flumpus pissed me off so much that i tied him to a chair and pissed on his face.
by ant April 02, 2004