Tdtf is the abbreviation of “too
drunk to fuck” (originating from the Dead Kennedys song).
This is used as an expression that you have really had too much to drink (or that you are
literally just too
drunk to fuck)
"
Man, Get me out of here, I'm tdtf!"
"sorry I'd love to go
back to yours but I'm tdtf!"
(Please note these examples are more coherent than you’d
probably get if the person is actually tdtf!)