"Big Tits-Dumb Bitch"; a woman with a bountiful bussom but an empty head; usually only good for sex or punch-lines.
Stan- Did you hear what that girl said?
Melvin- No what?
Stan- She asked if the garden salad had any dirt in it.
Melvin- Dude, what a BT-DB!
Stan- You said it my man.
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