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.
ayon kay RaisinLover ika-26 ng Setyembre, 2010
"Dude, how'd you get that gnarly scar on your arm?"
ayon kay 8380364 ika-29 ng Setyembre, 2007