- an erection of the penis.
Origin of hard-on
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for hardon
Oh, say, did you hear about the time Will Hardon had with the Dicky, last week?Brenda, Her School and Her Club
Helen Leah Reed
My name is Hardon; I came to see my father for the last time.
Doctor Hardon apparently thought it could, for there was a strange smile upon his countenance.
Doctor Hardon, portly and comfortable-looking, sat reading the evening paper just delivered from the stationer.
It never rains but it pours, and the storm fell heavily now upon the head of Doctor Hardon of Somesham.