1. Using a male pop star to wank off to.

2. Wanking it to Zac Effron.
Austin watched 17 Again and starting Zacking Off.
by TheIronLeaf August 22, 2009
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Zacking off is the act of masturbating in the shower using kiddy porn downloaded to an ipod or any other mobile video device. The device is usually placed in a ziplock bag to avoid water damage and being contaminated with bodily fluids.
Lee: Why does Zack always bring his phone with him to the shower?

Danny: Yea, I'm curious too since he takes 45 minutes to take a shower.

Lee: you think he's jacking off in there?

Danny: His name is Zack not Jack dumby.

Lee: I meant do you think he's zacking off in there?

Danny: haha yea i keep hearing weird moans coming from the bathroom and when he comes out he has the look of satisfactied on his face. He needs to wipe that smirk off.
by 6fingas December 26, 2009
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You can replace any curse word with Zack. preferably "fuck".
Person 1 - "Your a fag!"

Person 2 - "Zack off."
by Zack Belton July 12, 2008
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When your suppose to be working but your too busy doing an activty besides work in the bathroom, such as sleeping.
Hey man where the fuck did that fat fuck go? OH he is just zacking off in the bathroom again!
by AceAssGrinder69 October 8, 2017
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A sexual position where the male is behind the female who has one leg up(on a chair, stool etc.) and the other normally on the floor so she is standing and balanced. The male fingers the female with one hand, and carresses her breast with the other. This is good for foreplay to get both in "the mood", especially when in tight quarters. Derived from the "Magical Zack-me-off" where the girl is playing guitar-hero for the duration of the time.
Guy 1-Did you hear that me and my girl did the Zack-me-off in the bathroom at school?

Guy 2-No man, why'd you do that?

Guy 1-We didn't want to get caught so we went in the stall and space was tight.
by Z-Mo April 10, 2008
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A sexual position where the male is behind the female who has one leg up(on a chair, stool etc.) and the other normally on the floor so she is standing and balanced. The male fingers the female with one hand, and carresses her breast with the other. This is good for foreplay to get both in "the mood", especially when in tight quarters. Derived from the "Magical Zack-me-off" where the girl is playing guitar-hero for the duration of the time.
Guy 1-Did you hear that me and my girl did the Zack-me-off in the bathroom at school?

Guy 2-No man, why'd you do that?

Guy 1-We didn't want to get caught so we went in the stall and space was tight.
by Z-Mo April 9, 2008
Get the Zack-me-off mug.