eyeballing
verb
Definitions
To gauge, estimate or judge by eye, rather than measuring precisely; to look or glance at.
Example: A good cook can often just eyeball the correct quantities of ingredients.
To scrutinize
To stare at intently
Example: Are you eyeballing my girl?
To roll one's eyes.
noun
Definitions
An act of staring or ogling.
The practice of pouring vodka through the eye socket, falsely claimed to increase the rate of alcohol absorption.