1) An STD received through extensive contact with (usually involving the consumption of) armpit hair.
2) Today's slang for Vagina or Vagoo
Cleep can be found not only in those who suffer from this disease, but in addition on college futons.
Prevention of the cleep can be avoided by rubbing the head of a sweet and innocent head of an 18 year old boy who desperately lacks armpit hair.
"Dannng girl i hope your cleep tastes good cause I'm eatin it"