1.(Adjective) The sound a fist makes when it hits the small of a humans back IE. (Kidney Punch) (Donkey Punch)
2.(Adjective) The war cry of a Mongoose or Weasel
1.Wow, did you hear that fist go meef on that guys back?
2.Did you hear that Mongoose yelp meef before attacking that tree hugger!
When you're too gay to useswear words, or you just want to be a complete asshole, you use Meef to replace words. Try to use it at least once every 50 years to maximize its effect.
Faggot #1: Hey brah, I just meefed all over your toilet, and by the way...I mean jizzed
Faggot #2: Hey brah, it's okay. I thought it was like cream cheese or something, I ate it all up.