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1. Interjection, usu. preceeded by "oh" and or "buh."

2. Imperative, "calm down."

Etymology: "Sibbuh" evolved from the popular usage of "Simma," from "Simma down now!", popularized by the sketch of the same name on Saturday Night Live.
Ex. 1: James: I think we missed the movie.
Josie: Oh sibbuh. That was the last showing!
Colin: Buh-sibbuh!

Ex. 2: Stephen: What the hell! You cut in line!
Mary: Hey, sibbuh! Ok? Just sibbuh.
by Josibbuh May 29, 2006
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