Top Definition
To Middle Finger Swear on something.
Like a pinky swear except strongger.
"I'm going to buy you an iPod if you pay for half"
"fine, but MF swear on it first."
#mf #swear #oath #pinky swear #middle finger swear #finger #pinky #convince #first #pinkie swear #pinkie
by Mastersam0 June 11, 2008
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