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1.
In short, a homosexual woman, or 'lesbian'. Specifically, one who is considered quite fiendishly or excessively sexual.
Yeah, and now she's a taco monster!
by mbryo_ January 23, 2011
 
2.
One who goes for the "taco," or vagina. Synonymous with horndog.
God, that guy is always trying to get chicks. What a tacomonster.
by Horny Taco April 18, 2009