Top Definition
Acronym for Fat Ass MotherFucker, pronounced FAM-fer. Uses as an insult, often when observing the behavior of other drivers in traffic. Can also be used as a verb (to FAMF).
That FAMFer on a cell phone isn't watching where he is driving!

Look out for that car, he looks like he is going to FAMF into your lane!
by Malasada Bob February 20, 2008

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