Top Definition
The last name of a true legend, the holy Dutch war-king Lars van Proos. If a person is named Proos, he will without doubt be a generally awesome person, and if it's a man, his penis will be atleast 43cm long, it runs in the Proos blood!
Wow, did you see that mans penis??
Yeah, he's got to be a Proos!
by I am smart, you are not September 11, 2014

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