When something goes above and beyond the point of lame to the point where comparing it to plain homosexuality isn't good enough. The "B" adds an extra syllable, adding more intensity and homosexuality to whatever you're insulting.
"Hey man, I can't hang out, my mom's PISSED."
"Shit foo, that's extra b'gay!"
nothing to be ashamed of... sometimes they are all that's around. it's kinda like a moped, they can be fun to ride, but you don't want your friends to see you on them, ever.
you can't say shit you fucking pussy, you only hook up with B chicks, loser.