When men kick their leg, and purposely make their scrotum hit their upper thigh, creating a flop noise.
My testes hurt, because I just performed the kick flop.
από RaisinLover 26 Σεπτέμβριος 2010
"Dude, how'd you get that gnarly scar on your arm?"
από 8380364 29 Σεπτέμβριος 2007