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2.
When someone does or says something so stupid, you loose brain cells.
Douche: Yo BrO, ImMaa dr1nc maself sum be3r YOLO #SWAG

Me: Bro, you just gave me secondhand stupid, I literally lost a couple of brain cells.
by lacrosseman11 November 20, 2012
 
1.
The feeling that you are getting dumber by the minute, not from the beer, but from the stupid person near you that won't shut up.
"The second-hand stupid from Billy's girlfriend is frying my brain. I can't think anymore."
by Nostradumbass11 January 08, 2010