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2. Jonathans
A posh name for a "Jondoms" or "Jonnies", widely known as condoms.
A guy walks into a pharmacy:

"Hello shopkeep, a pack of your finest Jonathans please."
1. Jonathans
British slang term for diarrhea.

Most likely a variation on colloquial term "the trots", derived from the English cricketer Jonathan Trott
I had the Jonathans this morning.
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