A "spiker" is a rogue pubic hair that takes on the persona of an extremely hard piece of cotton (or even fishing twine) that has set up house in the front part of your undies. And usually makes an appearance when one is in a public place. Creating an irresistible urge to scratch your groin.
John got a spiker while at the supermarker. Drove him crazy trying to scratch it without being seen.
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