When something or someone is cringe. Based on the behaviour of Mr Schuester from the hit TV musical Glee to be Schuesty means to behave/look or own something that is so cringe it's uncomfortable.
Did you hear Mr Schuester rapping. I couldn't bear it. It was so Schuesty.
Omg. Did you see Emma and Callum kissing. Ew they are so Schuesty.