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"Just a friend"; a term often used to describe someone of romantic interest who has yet to be referred to as "boyfriend" or "girlfriend" in public or even among close friends. Often, both parties have a shared romantic interest in each other and haven't told anyone yet. At other times, one of them may be stuck in the friend zone. The "just a..." part is a lame attempt to conceal this fact everyone else already knows. Otherwise, the term friend is used instead.
Jay-Z was jaf to Beyonce for years and now they are married!

I respect people's privacy but who were they fooling?
by Doublestuff December 04, 2008
John Allan Forster Syndrome.
loss of memory, ability to bullshit for england. multitued of rude sayings, pledge never to take the blame for anything,loss of hair, bad breath and extreme smells.
"hello jack, i mean john, harry oh fuck whats your name?"

by harry the b*****d October 18, 2003
A person who stalks a bills50000 on the internet because he is jealous he didn't get anywhere near Mandy Moore. A playa hatah.
Oh look! There goes JAf' again, hating on bills50000!
by William August 16, 2003
just a friend
I don't want to sleep with you, I'm jaf.
by Anonymous April 11, 2003
Guy:who's JAF?
Guy 2: No one special
by MonJoe September 14, 2003
a half-mustache
You've got a JAF on your lip
by Forcey June 29, 2003
A cool dude
That blokes a jaf
by Dave February 03, 2003