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Coined by the popular character Biff Tannen from the Back To the Future movies, when one takes a known "exit" phrase and switches the ending so it no longer makes any sense. Often used for the enjoyment of obtaining a double take from the person with whom you are conversing.
Instead of telling McFly to "Make like a tree and leave," Biff told McFly to "Make like a tree and get outta here," thus committing a Biffism.
Biffism by OneNation October 7, 2007
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The many ways (strange/unusual/paranormal/hallmark/cheesy/corny/sweet/loving/controlling) your BFF behaves towards you and your shared friendship of devotion, adherence, usage, characteristic ,state or condition; which designates a doctrine to your referenced designated BFF.

-ism suffix (Greek) - formation of nouns which denotes practice or action from verbs.
Janny: Car - you need to get off your whorish way's on FB!

Car: Janny, thanks for your bffism all these years! Without your bffism, I would not be the same.

Janny: I TOLD YOU! STOP BEING A SLUT!

Car: Awwww - I heart you too! by the way, your bffism stinks!
Bffism by Car Sun- August 25, 2010
Related Words
To be so knoweldegeable about a subject that it as if you have worked out your brain to become buff, thus buffism
That will discredit your movie buffism if you recommend a movie solely because the actress is hot.
Buffism by Concessionist October 26, 2011
Word created by Mel and Lily to express another way to say “bffsie”
Mel and Lily’s bffism is off the charts today!
bffism by kous_bitch September 4, 2023