Definition of hard-on
hard-on 
noun
- an erection.
More words meaning: an erection
- a like of.
He's got a hard-on for the local sports team.
More words meaning: to like, enjoy
by WalterGR, Sacramento, CA, USA, Aug 26 2009 (Edit definition)
- an attraction towards.
He's got a hard-on for that blonde over there.
More words meaning: to be attracted to
by WalterGR, Sacramento, CA, USA, Aug 26 2009 (Edit definition)
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Slang terms with the same root words:
- hard: between a rock and a hard place – go hard – (show 8 more)
- on: accidentally on purpose – a slap on the wrist – (show 277 more)
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