An acronym that stands for Estimated
Time to Fuck. Used in time estimation on
one think they
will be able to fuck a particular person.
Guy 1: Wow that chick is really messy
drunk, what do you think her ETF is?
Guy 2: I say cab
ride
Guy1: So you still going out with that chick from J-date?
Guy2: Yes, my ETF is defiantly 4 dates and a meeting with the
parents.
Fat chicks are known for their low ETF.