Flep is used when wanting to take the piss out of someone showing off about sex: it is a joke 'orgasmic scream,' and should be shouted loudly as soon as a person begins to talk about the dodgy subject. It originates from the more random folk of South Wales.
"Yeah I did this girl hardcore last ni-" "FLEP" "Fuckoff"
by Adam Thompson 0000 March 02, 2007
2 more definitions
Flep is a term that by no means has anything to do with orgasm, but has come to be a "joke" orgasmic scream. It is used to make fun of anyone saying the word.
"What's your favourite word?"
by David Roache March 01, 2006
The act of flipping the fuck out.
Roger flepped when he heard the news.
by CoShaDedine May 24, 2011