Commonly seen in lower-quality television series, this is the repetitive back-and-forth movement of an actor's eyes as he reads the cue cards held up off-camera behind the head of the other actor he's in a dialog scene with.
"Did you see the last episode of 'Arrow'? David Ramsey was cylon-eying like a metronome."

Cylon eye: watch v=0ccKPSVQcFk
by Honeyko April 20, 2015
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