A mispronunciation of the commonly used word sex, usually by someone with a lisp
"my boyfriend and i were thinking about trying THEX EN TEH ATHOLE"
verb - to rub someones upper arm as if to flirt
Jim: haha, I'm thexign you!
Larry: WTF? you meeter!!!1 why are your flirtishly rubbing my upper arm? are you a homosexual?
Doing the deed under the name of Thomas. You do this to provide offspring for thommunism.
“Can we do Thex?”
“Sure, for thommunism?