Top Definition
Sibbar can be used in the place of the word "sister." It means the same, only it's 10x more fun to say. Especially if you say it with an annoyingly long "a" sound.
Annie- Sibbar, aren't those MY white knee socks?

Katy- No, sibaaaaaaaar, you said I could have them...remember?

Annie- Mom!! Sibbar stole my socks!!!
by katykook February 12, 2011

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