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stands for best mate for life
although normally used for a complete stranger
person 1: did you see that weird man at the bus stop
person 2: yeh he's my new BMFL!
by Nadie.x January 07, 2007
Be Mine For Life

A lame phrase used by sad people, generally when they like someone. Is popular among young people.
Hayley: Youre so nice :D
Leon: BMFL!!
Hayley: Erm, ok :S
by Sandwichadam February 23, 2009
Bust. My. Fucking. Load
Thirteen on House is so absurdly hot I wish she would BMFL
by WLY March 07, 2012