An abbreviation for “Just a Friend”, it’s what you call someone when you’re trying to get over them. Most of the time it sticks though and you just start referring to them by the name. The original “Jaf” was a middle school boy who over the past ywar or two has become a cultural icon.
A person who stalks a wordbills50000/word on the internet because he is jealous he didn't get anywhere near wordMandy Moore/word. A wordplaya hatah/word.
Oh look! There goes JAf' again, hating on wordbills50000/word!