The story
- Proto-Indo-European*dʰeǵʰ-
- Proto-Indo-European*dʰéǵʰōm
- Proto-Indo-European*ǵʰmṓ
- Proto-Germanic*gumô
- Proto-West Germanic*gumō
- Old Englishguma
- Middle Englishgone?
- Englishgooney
- Englishgoon?
- Englishgoon
- Old English*rodd
- Middle Englishrodde
- Englishrod
- English todaygoonrod
From goon (“to masturbate”) + rod (“straight shaft or stick; penis”). Compare goonstick.
Etymology from Wiktionary, CC BY-SA 4.0.