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2.
The act of going (poo) along another persons (buttcrack)
I made her lay on her stomach so I could give her a greasy taco.
by eric klotz December 24, 2003
 
1.
Another name for vagina. A dirty one that leaves marks in the underwear. Sometimes stuff drips out the bottom and runs down your arm while you are eating.
That whore has been with so many people I bet she has a greasy taco.
by Justin S February 07, 2005