When you're taking a bath and decide to pump one out in the tub.
"Man, last night was so relaxing. I had a bathtub circus before bed.
A three headed bathtub on Skibidi toilet
Skibidi bathtub is here Skibidi shower is coming soon
A poorly engineered thing; particularly one that is over-complicated, with excess and unnecessary parts. The term comes from a Heinlein quote/novel.
"If one is building an electric motor, one uses only the parts needed to do so. You would not, for instance, add a bathtub simply because one was available."
"Why does this thing even have one of those?"
"It's a bathtub motor."
The terminal velocity of a porcelain bathtub.
"When I was skydiving I almost went bathtub speed."
When someone commits suicide by slitting their wrist in a bathtub
She killed herself, it was a bathtub burial.
The act of putting your dong in the toilet and transferring it to the bathtub filled with water.
When I was at home, I had to take a shit. After I was done shitting, I gad to rinse my dong in the water of the tub. Then was born a new batch of bathtub toilet water dong
This is a state of inebriation when you get so drunk that you mistake a bathtub for a bed and fall asleep in a bathtub.
"She was so bathtub wasted she didn't realized she crawled into the bathtub to sleep instead of her bed."