1. a steel or plastic helmet worn to protect one's head from falling objects or debris.

2. a worker who wears a hard hat.
A hard hat is one tool that saves lives.
by Light Joker August 21, 2005
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A comdom or anything that protects against pregnancy
Let's go baby I got my hard hat on and ready to beat them guts
by corey hockenberry October 3, 2006
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Hard hat is a slang synonym for an erect penis.
For example "Honey i got a hard hat are you ready"
Or "hmmm this porn cause's meglo hard hat syndrome"
by Chris Woodruff August 18, 2006
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another way of saying you have a "hard on".
I have a huge life size poster of him all greasy and shiny with a "hard hat" on.
by vonnie lonnie September 15, 2009
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A term used to referto a Mexican or other Latinos.

This term was originated from the types of jobs that the previously mentioned have. Most of these people work on construction sites and therefore have to wear a hard hat
Look at that stupid hard hat building the new bank.
by YourMomGoesTo College February 12, 2005
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a helmet that people who work on construction sites wear, so shit doesnt fall on their head and kill them.
Mark: Holy shit Steve! Look out!
*Steve gets owned in the head by a brick*
Mark: Damn son, shoulda had your hard hat on!
by Kast April 1, 2006
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To tuck your erection in the waistline of your pants in order to protect yourself from the embarrassment of a public boner.
John: Why is Joey walking so weird?
Jimmy: Because he's definitely Hard-Hating it right now!
by Dean0530 November 5, 2011
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