BG

A Brain Giggle. It is a more authentic response to something funny than LOL. The Brain Giggle describes an internal response to hilarity, producing at the most a smile, but no actual laughter. To discuss BG's with a friend often sounds much less innocent than it actually is.

“Dude, did you see what Sarah posted on her Facebook?”
“Yeah, man, I BG’d so hard.”
“Weren’t you sitting with your parents?”
“I BG in front of them all of the time.”

by tkltkl March 5, 2013

BG

BG stands the the saying "Big Gay" or really gay.

That math test is going to be BG

by Sizz Kid April 21, 2006

BG

big girl. an insult to people who are neither big nor a girl.

You look so big when you drive, Jake. You're a BG.

by primusfan February 25, 2006

BG

male who has spikey hair usually taller than an inch and wears flannels

That kid was definitely BGing it today.

by Baby1Nolan May 15, 2008

BG

An acronym for "Bald Gangsta." This term is used to refer to the cholo type hispanic gangsta.

by KatieKaboom and aunt jeMAIma September 21, 2003

BG

Bad/Brian Girlfriend
When a guy starts dating in high school and his first girlfriend is one of the following: ugly, unattractive, overly tall, annoyingly loud, crazy, pathological liar, purple colored, or grinds like a whore.
When the guy breaks up and levels up to a normal girlfriend, the ex is referred to as his BG.

Ay mayne glad to see you finally got rid yo bitch. She was a real fugly ass pot bellied cerebrally chalenged BG.

by hulo December 11, 2010

BG

Black Guy, a term used by white folks when around black people to talk about them without them knowing, or to call someone black in general without them realizing.

That kid is such a bg.

by Morgan Davin September 29, 2007