When you are so gay that it can be classified as a disease and could be harmful to your mental and physical health.
I HAVE CRITICAL GAY!!!
A disease which slowly rotts the frontal lobe. This disease can be caused from many incidents such as not saying "no homo" after accidently making eye contact at yo homie for longer than 5 seconds, unironicly dabbing, laughing at minions memes, and much more!
mike: i caught my friend dabbing unironicly today
sam: he must have critical gay!