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1.
Low grade marijuana. Usually from Mexico. The prefix Mexi derives from poor, dirty, and smelly. Brown sometimes black and lots and lots of seeds.
Sam: Dude, I'm selling michael a joint of mexiweed for 15$. I'm telling him it's chronic.

David: Haha what a dumbass.
by Darkishpol December 06, 2010
 
2.
Weed that is sub-par. Weed that will get you by but will give you a headache.
I went to Lucio's house to get some bomb, but instead walked away with a bag of Mexi-weed.
by McGullicutty April 09, 2006