A term used mostly by gay men to depict something unpleasant, foul, or undesirable. Often replaces words such as stupid, dumb, gay, etc. Ugh, this is so vaginal, I have to work a 9 hour shift today! Those pants are straight up vaginal.
Warning signs such as fear and/or nervousness around other dogs, displays of aggression only under certain circumstances (while on leash, in the presence of food, in the presence of the owner, etc.), or most commonly, over-the-top play behavior can be seen at any stage of the dog's development.
Yet, other dogs may develop dog-aggressive behaviour due to medical reasons, such as hormonal imbalances. Dog aggression is a common dog behavior, and can be seen in all breeds of dogs. The breed standard usually spells out whether dog aggression is common in the breed and to what degree it is allowed.