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When you go down on a Mexican girl and you suddenly realize the someone blew their load in her just a few hour ago.
I went down on this chick and found out I was eating twatchos
by Dr. Phil McKrackin June 19, 2013
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When a woman drops a nacho into her lap.

Or

When a woman (has a fetish for Mexican food) puts tortilla chips up her vagina.
Mary made a mess of the nachos. She’s got a twatcho.
by Turnerm05 February 02, 2019
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