What is Siz?
1.
Short for sizzle, this word is used to reply when someone or some people are doing something very gay or very odd.
Siz, guy, calm down.
2.
Its a shortened version on "serious?" cozz it's easier to say.
Oh my god! Are you siz? LOL AT THAT
See
3.
Man loving
what a fricken siz!
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