Bottoms up!

bottoms up

A cheerful phrase or toast said before taking a drink. Ooh, that drink looks delicious—bottoms up!
See also: bottom, up

Bottoms up!

 and Here's looking at you.; Here's mud in your eye.; Here's to you.
Inf. an expression said as a toast when people are drinking together. (Alludes to the bottoms of the drinking glasses.) Bill: Bottoms up. Tom: Here's mud in your eye. Bill: Ah, that one was good. Care for another?
See also: Bottom