Brotha Lynch Hung's hit from the 1995 album "Season of da Siccness" Used as a universal insult for "tellin' some nigga that he ain't shit, and he can go to hell" or as a friendly gesture of farewell to a friend. "rest in piss man, ill see you later"
Ulzzang true definition is "best & "face" = best face in korean. They are basically people with above average looks, sometimes with the use of photoshop and haduri who post their pics online, some becoming internet celebrities.
"Hey, see that chick over there? She's pretty enough to be an ulzzang. :D"