The act of shaving your genitals then glueing the hair to your partners genitals with your cum.
Yo john lemme give you a Mexican tumbleweed
I gave Lucy a Mexican tumbleweed last night
by Sexy Finnish guy June 22, 2017
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Part 1: To shave off all your pubic hair and roll it in to a ball, using ejaculate as glue.

Part 2: sneak up on a sleeping or unconscious ( preferably naked ) victim.

Part 3: attempt to roll Said ball in to the open mouth of the target.
Hey man I gave Jenny The Mexican Tumbleweed last night, she almost choked. But it was funny as hell
by Finlonger October 21, 2014
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