What is T'chell-o!?
Expression of delight/awe in the presence of, or at the sight of, a sexually appealing individual.
Accent should be very heavily on the "-o!" part of the word. indeed the "-o" can go on for some time: "T'chell-oooooooo!"
Derived from "Hello"
Foxy walks past...
Dude A looks at Dude B, indicates Foxy, and says: "T'chell-o!"
Alternatively, if Dude A wishes to indicate their delight/awe to Foxy, then the "T'chell-o!" can be directly addressed to them. This may result in a slap in the kisser.