There are a couple meanings to this abbreviation "BG":
1) Commonly used in video games, bg is an abbreviation of "bad
game" used by
people who thought that the game/ round they played was a "bad game" (the opposite of
gg).
2) BG is also the abbreviation of the country Bulgaria (which can also be referred precisely as BGR).
3) B.G. ("Baby
Gangsta"), or Christopher Dorsey, is an
american rapper and hip hop recording artist from New Orleans, Louisiana.
4) BG, in arts, or other subjects related to arts, bg is an abbreviation of "BackGround".
5) BG, in french, is
short for "Beau Gosse" (Beautiful Kid), which is used, informally, to say that the child is beautiful. However, this can also be used in a sarcastic way; that the person is trying to act bg, although he really isn't bg (this bg is better used when speaking french, or speaking to someone that's bilingual in french and english. Otherwise, nobody will understand you...)
1) When your team loses by a mile and were'nt anywhere close to beating the other team, your teammates might say: "bg"
5) Normally:
"Le mec est tellement bg" ("the
guy is so bg". This could also be
sarcastic depending on if the person mentioned is attractive or not)
Sarcastically:
"PTDR, le moche fait trop le bg" ("
Lmao, the ugly is doing too much the bg")