Top Definition
When playing in extreme sports or running. Or fucking for so long and hard that you begin to perspire on your derf. (space between your balls and asshole.)
Shit Sydney! You made me get derf sweat! But damn that pussy was good!
#derf #ass #fucker #sydney schick #sweat #jon #jesus #tyler
by tit fucker October 21, 2007
8 Words related to derf sweat
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