Urusei (or urusai, seen both) = Shut up (lit. annoying, can also mean: You are annoying)
sukato: I've seen sugoi a lot, but mostly that is said by girls, also seen/heard sugei, and that was said by boys (IIRC)
Onegai can also mean "I leave it up to you/in your hands" or "please take care of things for me" (check goldenboy eps 1, nearly at the end)
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