Definition of BF in English:

BF

Syllabification: BF

noun

(plural BFs) informal
1A person’s boyfriend: I’ve been dating my BF since January
1.1A person’s best friend: Lottie is my absolute BF

Origin

from the syllabic initial letters of boyfriend, and the initial letters of best friend.

Definition of BF in:

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true