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1.
Action verb. To hit someone in the balls using a limp-writed backhand in such a way that each knuckle connects with each testicle.

A metaphor for being subjected to something so worthless you'd rather get hit in the balls.
He was rolling on the floor, fwabbaged from the new Justin Beiber song - ROTFF'd.

Example 2:
Dude 1 - your sister is a slut

Dude 2 - (backhands dude 1 in the balls). I'll fwabbage you again if you keep talking.
by pandabutters June 02, 2010