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1.
1. When the vagina gets hard,horny through sexual arousal usually by stimulation or during foreplay.

2. When a vagina gets hard/horny/aroused and it resembles a "hard taco"
Example.
1. Amber got a hard taco when she rubbed up against Daniel's leg

2. Susy got a hard taco when she kiszed Dave

3. When madison was horny, she had a hard taco
by xjaovsieer November 09, 2008
 
2.
crack cocaine
hey man, you got any of them hard tacos??
by xale420 September 15, 2008