hard-on

[ hahrd-on, -awn ]
/ ˈhɑrdˌɒn, -ˌɔn /

noun, plural hard-ons. Slang: Vulgar.

an erection of the penis.

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Origin of hard-on

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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