The condition of being so intoxicated (well over the standard tipsy, buzzed, inebriated, or even plastered state) that it will be a miracle if you live to see the next day.
The term was thought up as a result of the 2004 incident when An unidentified Taiwanese woman (dumb betch) died of alcohol intoxication after immersion for 12 hours in a bathtub filled with 40% ethanol (brilliant). Her blood alcohol content was 1.35% (which qualified her as being bathtub wasted).
That betch consumed so much alcohol she was nearly bathtub wasted.
I'm tryina get beyond blackout tonight, let's get bathtub wasted.