[BF] "Boyfriend"

[BFF] "Best friend forever"

[BFN] "Bye for now"

[BGS] An institution responsible for the creation of various colloquialisms, such […]

[big cheese] or [big gun] or [big shot] or [big wheel] […]

[big daddy] {n.}, {slang}, {informal} The most important, largest thing, person […]

[big deal] {interj.}, {slang}, {informal} (loud stress on the word "deal") […]

[big stink] {n.}, {slang} A major scandal; a big upheaval. * […]

[Billy] 1. Amphetamines (from Billy Whizz, a British comic strip character.) […]

[billyo] (also spelled billyoh) an intensifier. Going like billyo (travelling quickly).