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.
My chow passed away this weekend, I am heart broken. You can crank up most any dog to an aggressive state even playing. The problem with big dogs is that aggression can be dangerous. I walked and walked my chow when he was young, I think it helps establish you as leader of the pack and bleeds off built up energy.