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15.
BG
you know how you play "slug bug what color" when your extremely bored or if you just want to hit your friend, BG is a similar game in which you most commonly use in church to identify a BG or Bald Guy them following with a punch to the shoulder toward his friend.
Other words may be:
FG- Fat Guy
UG- Ugly Guy
SG- Stupid Guy
RG- Retarded Guy
HG- Hairy Guy
MG - Mutated Guy

and so on
person 1:BG (following with a punch toward his friend)
person 2:WHAT THE HECK!??

(yes i'm from Utah)
by the real steve.jobs March 30, 2010
 
16.
BG
It mean BACK GROUND!

not baby gangster!
like..
ur bg is sweet
luv ur bg babes
by carly_xx June 25, 2009
 
17.
BG
Baby Girl
I love you BG
by Leslie Flores December 26, 2009
 
18.
BG
abbreviation used for texting meaning "big grin"

can also have the prefix of a capital E added to it, meaning

"EVIL BIG GRIN"
that's hillarious char!!!! BG

MWAHAHAHAHA!!!! EBG
by dpfcharles August 03, 2009
 
19.
BG
Bedroom gangster.
yo, just been bgin' in allllll niiiiight. DAMN
by haaywoodjablomee May 23, 2009
 
20.
BG
1)Baby gangster, as opposed to OG. An OG has shot somebody, a BG has not shot anyone yet

2)Black Gangster
1)"I quit school cuz of recess, you fuckin BG-- Snoop Doggy Dogg

2) look at that BG
by ac January 31, 2004
 
21.
BG
An abbreviation of the website becomegorgeous.com. (A website with makeup and fashion tips. Mostly for girls and a few gay guys) This is used because although the website is amazing, the name is not. the name is actually pretty embarrassing. Saying BG instead of Become Gorgeous is faster, and less embarrassing.
EMBARRASSING -

Girl 1 - whats up?
Girl 2 - nothing, on BecomeGorgeous!

NOT EMBARRASSING -
Girl 1 - whats up?
Girl 2 - nothing, on BG!
by SnoopyDuke February 02, 2011