When a promiscuous female enjoys herself a sexual encounter in which the male releases inside of her, only to have an encounter soon thereafter with another male who (unknowingly) enjoys the fruits of her previous labor, straight from the source.

In layman's terms: some horny dumbass finds a slut willing to play and goes down on her after she's freshly fucked another dude and still has his jizz in her.
He was so drunk that he eagerly went down on her and ate her salty taco, previously tainted by his buddy.
by bigtexwanker December 16, 2009
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What you tell people you really mean when you say that you have an STD. Which really isn’t much better than having an actual STD..pretty much a lateral move.
Devin: Hey Chris, Linda told me that you have an STD. Really unfortunate, I’m sorry to hear that.

Chris: No no, I don’t have an STD, it stands for salty taco dick.

Devin: Oh..ok tight.
by Kenny and Dan February 28, 2019
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