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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
 
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