A un-athletic person who is real weak, but not small, their body is almost jello like. This person will not be very active and will sit around all day playing mostly videogames. This person also has very little muscle for their size. This person is also under constant suspision that everyone is watching him or her.
Wow, that kid is really flumby, let's go beat the shit out of him!
by Urban Dictionary January 04, 2005
A flumby is when someone is getting a BJ while sitting on the can.
I received an awesome flumby while taking a mean growler.
by Fred Flumby March 14, 2005

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