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1.
To fall asleep, usually a deep sleep. It happens after a long day or doing drugs, commonly happening quickly or without warning. It may be one of the best kinds of sleep.
You're not gonna zonk out after smoking that bowl, are you?
by RubbingAlcohol March 22, 2009
 
2.
v. A subtle way of asking someone to fuck.
Hey Brandon, do you wanna zonk out?

Wow, I'm tired, Let's zonk out together, in my bed.
by dodobird736 June 11, 2009
 
3.
To receive a score of 0 when playing zonk.
Simeon zonked out on his first turn today.
by GuidoPosse69 February 20, 2005