The Rice University Neologisms Database

To deform or distort into the shape of a taco. The word “tacoed” is a derived past-tense verb form of the Spanish loan word “taco”. The word was used to describe the shape of a tuba after it had been dropped and bent. The shape of a taco was applied metaphorically to the shape of the newly deformed tuba. “Tacoed” was chosen by first selecting a noun that resembled the form of the tuba and then deriving a verb from it by appending the common verb forming suffix “-ed”. The reason “tacoed” was used instead of a more conventional word such as “destroyed”, “damaged”, or “broken” is two-fold: first, Seth chose the word to better describe the shape of the tuba. Not only was the tuba was broken, it had now taken on the shape of a taco. The second reason is for humorous effect. Seth mentioned already that the tuba was dropped, so the expected response would be to say it was damaged or broken. Instead of this response, Seth used “tacoed” to add a comic punch to his statement.