This is 'hello' in Simlish. Simlish is the language that Sims speak. Whilst playing The Sims 2 or The Sims 3, when Sims greet each other they say 'sul sul'.
Sul is a Persian/Turkish nick name he's usually a tall, dark and handsome guy with literally no flaws. He's very intelligent and gets all the chicks because of his extreme wit, good looks and awesome personality. He's the type of guy with 18 inch biceps and an even bigger penis.
Girl: I think I just creamed myself who's that sexy motherfuckerover there?
Girl 2: You're joking right? That's Sul you've got no chance with him
Girl: He stands out like a fucking angel
A form of saying "what's up?," derived from the poor grammatical abilities of a man in Bradford, PA. Wal Sul has been manipulated over time and still can be, due to a liberal vernacular. It's main region of use is NW Pennsylvania.