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When, after smoking a large amount of marijuana, a person actually becomes green in the face, appearing slightly like Shrek from the movie, Shrek
Collin: Dude, Nathan you smoked so much weed.

Nathan: Uhh.... Dude....

Jackson: Nathan, you're like... Shrekking it right now, you're so high.

Collin: Yeah dude, you're totally green.
by Greenmanman November 26, 2009
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