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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

The official bffs

This group is owned by patty, leona, Alyssa, kj and blurry
#dude 1: who’s one of ur favourite group member in the official bffs?
#dude 2: mine is patty
#dude 3: mine is leona

#dude 4: mine is alyssa

#dude 5: mine is blurry
#dude 6: mine is kj
Every dude be like: 0-0
The official bffs by Its_p1x1e July 15, 2020
best friends for six months; as coined by Jimmy Fallon and Stephen Colbert
Tracey: Hey can I borrow some money?
Victoria: No way!

Tracey: Oh my god, you are so not my bffsm anymore.

or

Dido: Aeneas is my bffsm because he left me even after our cave sex, to found the Romans.
bffsm by Misenus April 17, 2011
A form of 'brotherhood' or 'sisterhood' between best friends.
OMG, I love our Bffhood
Bffhood by Meow18 April 12, 2011
SHe was my BFFHLWL
BFFHLWL by KatyNevaeh December 27, 2011
pronoucned: biff-uhls
more than one best friend for life
I'm hanging with my bffls tonight, how about you?
We're bffls!!
bffls by that_random_blonde April 22, 2009