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.
Student 1: She actually thinks Harry Styles wants her! HA!
Student 2: Please! She is way too quiche for him to even notice. Swerve.
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 last piece of food left. hense "your a quiche"