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2.
Someone who breaks a pinky promise, on top of already being a jerk, hence being a doublejerk
You promised to run the mile with me! I don't feel well... Wow, Julie. You're a doublejerk!
by SKMh May 10, 2011
 
1.
Someone who breaks one or more pinky promises.
Ainsley: Julie, pinky promise you'll run the mile with me!
Julie: Okay! I pinky promise!
Ainsley: Hey, you never ran the mile with me! You doublejerk!
by Doublejerk May 16, 2011