eyeballing

/AY1 B AO0 L IH0 NG/
verb
  1. 1

    To gauge, estimate or judge by eye, rather than measuring precisely; to look or glance at.

    โ€œA good cook can often just eyeball the correct quantities of ingredients.โ€

  2. 2

    To scrutinize

  3. 3

    To stare at intently

    โ€œAre you eyeballing my girl?โ€

  4. 4

    To roll one's eyes.

noun
  1. 1

    An act of staring or ogling.

  2. 2

    The practice of pouring vodka through the eye socket, falsely claimed to increase the rate of alcohol absorption.

Source: https://en.wiktionary.org/wiki/eyeball, https://en.wiktionary.org/wiki/eyeballing