A boner resulting from an unexpected occurrence.
"How was the movie Charles?"
"Pretty good Matt, halfway through Jennifer Aniston started blowing a banana and not going to lie but I popped a jimmy so big it knocked over my popcorn!"
by WillithanSmith January 10, 2014
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a phrase used when somebody says something that you don't know the meaning of.
Person 1: I was in my room changing and a Peeping tom walked by outside the window.

Person 2: Pop Jimmy...wtf is a peeping tom?

Person 1: It's a spying pervert.
by KbaRn July 30, 2006
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