eyeballer

Meanings

1. One who estimates or judges based on visual inspection rather than detailed analysis.
2. A voyeur or inquisitive person.
3. An investigator who watches for signs of anything unusual or suspicious.
4. A secret accomplice who surreptitiously watches the competition and interferes by causing a distraction to prevent the opponent from getting a good shot.
5. Someone who stares at another in order to intimidate them.
6. Something eye-catching or worth noticing.

Etymology

From eyeball + -er (agent noun suffix) or, for something eye-catching, + -er (patient suffix).