The phrase "side eye" means to give a quick, suspicious glance or look at someone or something from the corner of your eye. It generally shows doubt or disapproval without saying anything.
Sentences with «side eye»
They gave side eye to these claims as well. (health.com)
There was definitely major side eye and passive aggressive behavior involved. (theheartsdlite.com)
Of course it wasn't everyone, but at 15 when the slightest side eye could send you crying to the bathroom, it was everyone. (pumpsandpushups.com)