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1.
When the man is taking a dump and has a raging member, (similar to a pulsating titans toe) he then plugs the woman's anal cavity with said member whist she pisses through his legs.
After Elwood had been strumming Butters to the point of gushing her vaginal fluids everywhere she begged him to pull out the Jimmy on her.
by ScottElwood May 12, 2011
 
2.
A San Francisco colloquialism for that tingly feeling you get when turned on.
Late at night, I start giving myself the jimmies when I stare at my poster of Edward Cullen for too long.
by Carly Wild April 07, 2010
 
3.
irritable behavior that is induced when a person goes without sufficient quantities of food
He forgot to eat breakfast so he has the jimmies again.
by abuyamis August 25, 2010
 
4.
The down-low on a subject. The jimmy is the short explanation of the details; the main point of a subject or discussion.
"Give me the jimmy on these new bagels."

"What's the jimmy on that order you placed last week?"
by Good Deal Neil November 15, 2013
 
5.
A derogatory term for a person who thinks they're "all that and a bag of chips." This person usually talks in the third person, because they like saying their own name.

From the Seinfeld episode of the same name, Jimmy was an egotistical character who played basketball with Kramer, George, and Jerry. He refered to himself as "Jimmy," as in "Well, Jimmy's gotta hit the showers."
Jon: "Well, Jon's gonna go get some chips. Can Jon bring you some?"
Sam: "You asshole, what are you trying to be, The Jimmy?"
by MC Westy P April 03, 2006