It means when your so fat that people can tell just by hearing you say words with a B in them.
"I bBought bBrenda a bBracelet for her bBirthday party."
"Dude whats wrong with your talking?"
"Oh jeez. I must be getting B-word fat. I need to diet."
A song by Rusty Cage. The lyrics are as follows:
Ohhhh
Fuck Shit Damn Bitch Cocksucker
Pussy Asshole Cunt
Mother Fucking Dirty Whore
Shat onto my lunch
Piss Cunt Damn Bitch Suck My Dick
Jesus Harold Christ
Shit Bitch Cocksucker
Goddamn Motherfucker
Pussy Asshole Cunt
Mumkey: Now that this video is demonitized anyway, we can sing the Cuss Word Song!
Rusty: Oh really?
Mumkey: Do you remember the lyrics?
Rusty: Boy do I ever!