If somebody is talking about something different than what you are talking about. It usually implies that if you continue to "talk tacos" while I am trying to push across a certain agenda, violence will ensue. Originated as a response to somebody suggesting that because there was no halal cart open (for chicken and rice), late on a Saturday night, a nearby taco cart would have to suffice.
Thomas: Yo, I really want some chicken and rice, we should go down to 53rd and 6th.

Erik: I need some cnr.

Eric Weiser: Yeah, my mom won't let me stay out that late we should just get tacos at the cart on 96th and bway.

Erik: He's TALKIN' TACOS.
by TOMMITOMMI12 December 9, 2008
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