From the Urban Dictionary definition for “side eye”

A facial expression expressing one’s criticism, disapproval, animosity, or scorn of varying levels of intensity towards another person. Defined by one person looking at the other out of the corner of their eye(s) with a scowl, as their head is turned in a different direction. Often an invitation for a fight or confrontation of some sort. Synonymous expression: “cuttin’ your eyes” (at someone). Popular expression (and common occurrence) among urban American populations.

This photograph is the new canonical illustration of “side eye” found in the wild.

On a side note, I’m unironically loving Kim Kardashian’s new style.

via Courtney