DTF means furry speak for Drop That Fur meaning they want pics of you in a furry suit because they're interested in you.
Hey baby DTF that kitty costume ya got
stands for darn tootin’ fun
“I am darn tootin’ fun. DTF. Seeks same. I’m Dicing.” -Jess, New Girl 2014
Dtf is abbreviated for “down to fuck”. The only people that use this are cringey fuckboys and Seth In Superbad
Guy: “ You are giving me mixed signals and I wanted to know if ur dtf ”
Girl: “wtf I said hi to you once”
Dtf means dolan twins fandom
Example dolan stan:Lisa are you in Dtf ?
Lisa:no i am in k pop fandom
Dolan stan:than fuck off