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[hahrd-on, -awn] /ˈhɑrdˌɒn, -ˌɔn/
noun, plural hard-ons. Slang: Vulgar.
an erection of the penis.
Origin of hard-on
First recorded in 1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Origin and History for hard on

"penile erection," 1893, from hard + on.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for hard on



  1. An erection of the penis: It was another one of those subway things. Like having a hard-on at random (1893+)
  2. A severe and intolerant person, esp a martinet leader or superior: Stone is turning into a world-class hard-on (1980s+)

Related Terms

have a hard-on for someone or something

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with hard on

hard on

Also,hard upon, hard by. In close proximity, as in The police were hard on the heels of the thieves, or It was hard upon three o'clock, or Their house is hard by ours. The variants are used less than hard on. [ Second half of 1700s ]
be hard on. Deal severely with, cause damage to. For example, He asked the teacher not to be too hard on those who forgot the assignment, or That cat has really been hard on the upholstery. [ Second half of 1600s ]
Also see: hard time, def. 2.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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