A simple, homely, or basic person or thing. It is often used to describe someone who clearly attempts to be extravagant, creative, and grandeur but is really about as plain as a bag of potatoes.
quiches are a type of food which is very plain and boring! what is good about a quiche they are only ever eaten because they are the lastpiece of food left. hense "your a quiche"
"Guys will eat an omelette and a pie crust separately, but the d**kheads won't eat it together. I'm down with quiche, and f**k anyone else that ain't."