When people are being really stupid and irritating and disrespectful, and things are really corrupt you use this abbreviation which stands for "Bitches These Days"
Person 1: Emma hooked up with Kaylee's boyfriend Alex???!!!
Person 2: What the eff is up with that?! BTD!!!!!
Recently fabricated acronym meaning "Better Than Decent", which translates to above average, mainly used to describe chicks, food, and blowjobs. Similar to C+ to B rating
"That chick wasn't bangin', but she was BTD!"
"Your fellatio was not average, but I would say definitely BTD!"
"This BTD pizza will at least satisfy my hunger for now."