To screw up successful ongoings for no reason other than to cause a buzz.
"My God, Joel Schumacher totally pulled a Jemas with 'Batman & Robin'!"
by Sag November 10, 2003
Top Definition
Comes from the word "jem"
Meaning something that was done very well using both style and edge

"Bro that was the absolute jema"
by cunninghambaby August 23, 2008
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