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1.
n. a person of poor social standing, widely disrespected and completely untrustworthy, a hustler or con artist.
"He loaned his ride to a couple of them jim-jims uptown, now he's walkin'."
"I want to be a jim-jim just like Uncle Bobby, ride around in a big spensive car and drink whiskey all the time."
by buddyray June 01, 2006
 
2.
Slang term for the ADHD medications Ritalin and Adderall.
Dude, you got any jim jim?
by THE UNKNOWN June 07, 2004