British slang term for an erection. Blunt, unadorned, and unapologetically British in its no-nonsense phrasing — 'rod-on' is the kind of phrase that gets a laugh precisely because it sounds like something a plumber would say. It belongs to the long tradition of British vulgar slang that treats the body with cheerful practicality rather than euphemism. Mostly heard in casual male banter or comedy contexts rather than polite conversation.
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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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Fuckrod is a vulgar British-flavoured slang term with two main uses: as a crude anatomical term for the penis, and as a general-purpose derogatory insult for a contemptible or obnoxious person — in the same register as 'dickhead' or 'knobhead.' As an insult it emphasises the target's objectionable behaviour rather than their intelligence specifically. Emphatically informal and offensive; it sits at the harder end of sexual and insult vocabulary.
Bonk-on is British slang for an erection — built on 'bonk', one of the UK's most cheerfully casual words for sex. It's a very British construction that manages to take something that sounds juvenile and make it even more so, which is precisely the charm. You'll encounter it in British comedy, lad mag culture from the 90s and 2000s, and candid everyday conversation. It's crass but not aggressively vulgar by UK standards, where 'bonk' has always sat in the amusing-rather-than-shocking zone.
(sexuality, slang) The penis.
He embarrassingly got a rod-on during the slow dance and had to maneuver his way off the floor.
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(UK, slang) An erection of the penis.
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(UK, slang) An erection; an erect penis.