taco v. especially in cycling, to bend or fold (a wheel) in the middle. (source: Double-Tongued Dictionary)
Further reading
That sputtering noise when someone sticks out their tongue, puts their lips together, and blows is called a raspberry. No one knows the origin of this slang term, although it may have to do with that pileup of consonants colliding in the middle of...
You might describe someone particularly talkative or gossipy by saying that their tongue wags at both ends. A more elaborate version is Your tongue wags at both ends and is tied in the middle. Another variant: Your tongue is hinged in the middle...