Top Definition
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.
by Misenus March 30, 2011

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