Comes from the definition of "Pony": referring to an attractive female.
Can be used as a compliment by women in a sexual way or by men in a non-sexual way, but is mainly used as a self title.
"Your lookin like a genuine mony today stud."
"Do you think that guy's a mony?....fag"
"Monies know they'll be gettin their dick sucked."
"I'm off gettin monied up at the gym."
Fred - Yeah man, I got some weed.
John - Solid or Grass?
Fred - Solid
John - You suck!
Fred - What?
John - Solid sucks you fag!
Fred - Your a fag man!
John - Il will fucking kill you!
Fred - Fuck you, you aint getting a pass!
John - I don't care man, I have REAL weed!