Petri Douche: A place/location where a lot of douchebags are known to congregate.

A place that attracts and seemingly breeds chavs/douchebags/jackwagons/etc etc.
Oh hell no I'm not going to Wetherspoons, that place is a petri douche!

Or: urgh why would you want to go to Las Vegas, that place is such a petri douche.
by ameribrit January 09, 2011
A petri douche is that friend you are sexually involved with who repeatedly has sexual encounters with others thus exposing you to the many germs and diseases they have come into contact with.
Dude, Joe is such a petri douche! Turns out he's been fucking around again and now I have herpes!
by WranglerTi December 04, 2013

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