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!
Look out for that car, he looks like he is going to FAMF into your lane!
by Malasada Bob February 21, 2008