1. When the vagina of a particular woman cannot be imagined with great accuracy
2. A woman with whom sex would be unimaginably unlikely
3. Adjective for an amazing vagina
1. Matt: She's hot but I cant picture her vagina.
Fred: Yeah, its univaginable.
2. She's so hot, but it would be univaginably unlikely that I'd bang her.
3. WOW! That vagina is univaginably awesome.