Top Definition
The look a guy gets on his face while masturbating. Most males get a jerk smirk on their face because of the uncontrollable pleasure they are feeling. A jerk smirk can last for several minutes after a guy ejaculates.
Duder 1: "Hurry up in there dude, I gotta trim my bush."

Duder 2: (comes out of bathroom) "Sorry dude, it's all yours."

Duder 1: "What the hell is that jerk smirk on your face for? Awww dude if I step on any of your nasty ass cum..."
by westfalia December 29, 2009

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