-(noun, pl: Yassins)Commonly used for a guy, who seems to be rich, but living in the local junkyard. He also usually hangs out with rich kiddies with small penises to fool other people into thinking he's rich. The type that'd marry a Shaniqua.
-(verb) To totally screw up a situation/Turning small issues into seriously big problems.
-Hey dude, that guy must be very rich, check out his expensive clothes!!
...NOT, he's just al Yassin, he probably stole those things.
-Oh damn, did you see him assassinate his teacher after he got his results for his show-and-tell?
Sure, he totally Yassined that situation.