1 definition by Britney Kay

one's BFFL, or Best Friend For Life. it is supposed to be the opposite sex, whom one is JUST friends with, and wouldn't ever date. however many biffles become boyfriends, which really defeats the purpose. unlike best friends, you can only have ONE biffle.
"I heard you and Johnny have been hanging out a lot, are you dating?"

"No way, he's my biffle, duh."
by Britney Kay September 30, 2005
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