What is a cat's pajamas drink?

Excuse me, but could you possibly clarify what you mean by "a cat's pajamas drink"? I'm familiar with the colloquial expression "the cat's pajamas" which is often used to describe something as being particularly good or excellent, but I'm not aware of it being applied to a specific type of drink. Is this perhaps a regional expression or a reference to a particular cocktail that I'm not familiar with? Could you provide some additional context or elaboration on what you're referring to?