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1.
When you're watching porn and one of the actresses very closely resembles someone you know in real life, so much so that it is like watching the person you know performing. The porn star is your hot friend's porn double.
That girl taking it up the ass is Amy's porn double!
by craigy2 April 17, 2009
 
2.
A porn star who resembles a real life acquaintance.
Joe: Dude, your kid's babysitter is so hot. Do you spank it to her?

Frank: You know it. In fact, I found her porn double online, which seriously upped my fapping.
by drpooterpie October 30, 2013