1. The odor of a sweaty yambag, reminiscent of a taco that has been sitting at room temperature for several days.
2. Scrotom odor.
3. A sweaty male undercarriage. Musicians, most notably drummers, experience sweaty crotches from playing. Removal of pants often smells like an abandoned taco after a gig
4. Hot balls.
Q: Hey, you want to go to that nudy bar after the gig?
A: I gotta get a shower first. I have some rancid tacobag going.
The female version of a teabag
Girl1: "im gonna tacobag you you asshole!"
Guy1: "go ahead..i mean please nooooo anything but that..."