Bottoms up

[nq:1]I have come across the following expression. It gives new meaning to the term "bottoms up." Will you kindly tell me what it means and where it comes from originally.[/nq]
"Bottoms up!" is a friendly, informal toast. That is its purpose, the only real meaning that it has. It is derived from the fact that when one is taking a drink, the bottom of the glass faces up.
The author has like

[nq:2]I have come across the following expression. It gives new ... me what it means and where it comes from originally.[/nq]
[nq:1]"Bottoms up!" is a friendly, informal toast. That is its purpose, the only real meaning that it has. It is ... = "a person's bottom, that is, buttocks," but I can't know that for sure without knowing more of the context.[/nq]
This sort of joke was characterist

[nq:2]I have come across the following expression. It gives new ... me what it means and where it comes from originally.[/nq]
[nq:1]"Bottoms up!" is a friendly, informal toast. That is its purpose, the only real meaning that it has. It is ... = "a person's bottom, that is, buttocks," but I can't know that for sure without knowing more of the context.[/nq]
There's a little more to it than t

[nq:2]"Bottoms up!" is a friendly, informal toast. That is its ... can't know that for surewithout knowing more of the context.[/nq]
[nq:1]There's a little more to it than that. The fundamental idea is that one is to drain one's glass in ... were even conical glasses, which could not be put down until empty, specially made for these heavy-drinking sessions.[/nq]
Sorry, I'm not following th

[nq:2]There's a little more to it than that. The fundamental ... put down until empty, specially made for these heavy-drinking sessions.[/nq]
[nq:1]Sorry, I'm not following that. Conical-pointy side up, or conical-pointy side down? In either case, why would you be unable to put it down? Don't you just reverse the procedure you used when you picked it up?[/nq]
Conical-pointy side down. Put

[nq:2]Sorry, I'm not following that. Conical-pointy side up, or conical-pointy ... reverse the procedure you used when you picked it up?[/nq]
[nq:1]Conical-pointy side down. Put it down and the contents spill. I suppose you have to be holding it in your hand when it is filled.[/nq]
I've not seen the conical-shaped glass, but the long glasses with the round ball-shape at the bottom are used

[nq:1]I have come across the following expression. It gives new meaning to the term "bottoms up." Will you kindly tell me what it means and where it comes from originally.[/nq]
Without context it is impossible to tell what the meaning is, especially since it apparently doesn't mean the same as the original meaning.

Steve Hayes from Tshwane, South Africa