Move The Fuck Along.
Generally used when trying to hurry an easily distracted friend up.
Dude - we're late for T Steppin at Barney's!
Oh man I just found this totally rad website about pokemon being real!
DUDE-MTFA! MTFA dude.
Stands for "Meier's Taco Fingering Action". Used to slyly discuss when a drunk jackass becomes overly friendly with a female friend and tries for an experience that she will remember, er, fondly.
Hey dude-- you're covered in vomit and you smell like a goat. But at least you got some MTFA.