MITF

abbreviation commonly mentioned to describe someone who outwardly appears normal but when engaged in any kind of conversation is quite clearly 'Mental In The Face'

dude to stranger: hey what time is is it bro?
stranger: no idea dude, but you can have you some mincy gravy from the durty tray if you like?
dude to stranger: you are completely MITF!!!

by reggieman August 2, 2012