Get (out)
Funny how many Russian words transliterate straight to English.
It is one of those Ukrainian interjections that has no analogy in Russian, and I only understand Ukrainian as I bridge my Russian and my Bulgarian and take guesses.
This dictionary explains:
геть! out, away, down with! геть! його! — out with him! ідіть геть — out with you!, get out!, clear out!; амер. go chase yourself! геть! з-перед очей! — get out of my sight!