Top Definition
The feminine version of brohaus.

Haus being a person who is freakin' awesome.
Sister being a girl you you're close to. Not literally.

It's a good thing.
You: Nice talking to you sishaus!
Her: What?
You: It's like sister and haus put together.
Her: What?
You: Nevermind...
by Uoakari July 20, 2011
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