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?
When you're too gay to use swear 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.