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.
He had to stay seated for an extra ten minutes on the bus, thanks to a well-timed bonk-on.
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(UK, slang) An erection of the penis.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.