A euphemism for the term 'genital warts', which can be used (usually by a male) in place of the proper terminology in an attempt to soften the blow.
Sexual partner: "Have you been tested?"
You: "Yeah and I was totally clean, unless you count gentleman's warts, WHICH I DON'T."
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When you wore a condom and still caught something.
Billy always practiced safe sex but he still got gentleman warts.