To punch or kick someone in the mouth
"This guy was tryin' to mug me the other day, so I toothached him and ran like hell!"
by Makana McDonald August 09, 2005
A term coined from the movie "Clueless", describing that something is so sweet, too sweet, that it causes someone to have a toothache.
You are so sweet you give me a toothache.
by joyjoy617 April 10, 2007