¿Cómo está la vaina?
Well I know that "que Vaina" means "What a mess" or "How f**ked is this" and commonly used as an expression on anger.
And that "Que Vaina es esta?" means "What the hell is going on here?"
And that "La Vaina" is a "mess," or a "problem"
but I have never heard "Como esta la vaina" before.
"viana" is dominican....it's slang (watch out for the slang police). Viana is a general pain en el culo. No one says "como esta la vaina" It's usually "Que vaina" or "me esposa me da vaina" something along those lines. Otra por eso es "cono" which is damn, s@#$, or any other thing that is a pain.
Sometimes we say ¿qué pedo? to say whats up lol that is mexican slang... so if you ever hear it... now you know
I lived in Venezuela for 3 months and always heard, Como está la vaina? I heard it many times everyday. I thought it meant How's the pussy? because it was always uttered by men, the more macho, the more they said it, and it rubbed on the ears of old folks bad. like acid.
It can also mean "scabbard" (and thus a metaphor of which Freud would approve) but the dictionary includes "pain (muy informal) (problema, molestia) (Colombian Spanish, PerÚ, Venezuelan Spanish)"
Vaina is definitely something many dominicans use. I am from Belize but hang out with many Dominicans. "Vaina" is a word that is used to substitute something that you don't want to say the whole name of. Example: If there is a jacket some place, you can tell a person "pasame esa vaina" instead of "pasame esa chaqueta" ... Como esta la vaina simply means, how is everything.. or how are things?.. many Latin countries use this word...