Frat boy #1: Dude that girl is totally DTF!
Frat boy #2: Nah man, I think she just broke up with her boo... she doesn't want your curved penis.
Frat boy #1: Down to frown man, down to frown.
Example:
When someone is annoying a group of friends, and they want to get rid of him, they can use it in "code" to tell each other in quick they don't like that extra person.