Mountain Biker slang for a wheel that has met a rock or some other obstruction quite forcibly, causing it to almost always bend into the shape of a taco shell (they started out as nice round tortillas, remember?). very much unrideable at this point. the tire, tube, spokes, nipples and hubs are often recoverable, but the rim is now a souvenir of whatever you just hit. usually used as a verb in past tense:

"Dude, i endoed over all that nasty washboard and tacoed my front wheel. That's the third one on this trail!"

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