When someone is not feminine enough to be called a female nor masculine enough to be called a male. Originated from Steven Universe when a boy fused with a girl. Used as an insult to one who looks like the opposite gender without trying.
Garnet: Stevonnie, listen to me. You are not two people, and you Aare not one person. You are an experience.
Person 1: Hinata is hottest Naruto girl.
Person 2: Nah, Hinata is an experience.
When a tone-deaf waitress at the Waffle House sings Happy Birthday.
What I don't want for my birthday is a Covfefe.