The act of defecating or urinating in a bathtub. The act is typically paired with intoxication and generally results from apathy or else long waits for the toilet.
Dammit Andy, you pulled the Nevada Tub Thump again? Was it number 1 or number 2? Terrible.... just terrible.
A tub thumper is a drink comprised of a shot of whiskey, a shot of vodka, a shot of lager, and a hard cider. The ratio of each is totally up to the drinker, but all four must be in the mix for it to be considered a tub thumper.
Engaging in sexual activity (usually intercourse) while under water . . . most commonly in a hot tub or bath tub but can refer to pools, lakes, ponds etc..