A ridiculously strong and ever-lasting oath. If broken, results in flipping off the promise-breaking party by the promisee as well as loss of respect and other unspeakable emotional, physiological, and physical consequences. More binding than a pinky promise. Abbreviated as MFP.
I flipped her off after school today because she hooked up with him, even after she Middle Finger Promised me she wouldn't.
by thecockblockersss June 14, 2010
Similar to a pinky promise, except with he use of the middle fingers. Usually a bond between two bros. It's a promise, acknowledging, "if I break this, I'm fucked."
Bro 1: Is this shit legit?!

Bro 2: I middle-finger promise!

A bond then can never be broken.
by JaRoy October 19, 2011

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×