Etymology

irrumation

ir·ru·ma·tion
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Today it means: The act of, or an instance of, thrusting the penis into the mouth; active penetration of a mouth. Full definition →

Latin irrumātiō ← Proto-Italic *en- ← Proto-Indo-European *h₁én
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The story

  1. Proto-Indo-European*h₁én
  2. Proto-Italic*en
  3. Proto-Italic*en-
  4. Latinin-
  5. Latinruma
  6. Latinirrumō
  7. Latinirrumātiō
  8. English todayirrumation

Learned borrowing from Latin irrumātiō, from irrumō + -tiō.

Etymology from Wiktionary, CC BY-SA 4.0.