A verb that reveals that information about the subect is not recent, but rather from an earlier time. Also, the word is pronounced "bin" and needs heavier emphasis. The expression sometimes does not need a subject.
[Nas] on [Ether]: " (Fuck [Jay-Z]!) You BEEN on my dick, nigga. You love my style, nigga."
^The line implies that the subject ([Jay-Z]) is not a recently-turned fan of [Nas], but that he was a fan of [Nas] for a long time now.
Gabe: "Yo, I don't wanna go on the roller coaster. The last time I went on, I was 10 and I was crying after I got off."
Felix: "Wow. BEEN [soft]."