1. sexually aroused.
|Weed (1998) 127: Fresh home and hard-on, he’d found the street and apartment.|
2. tough, aggressive.
|letter 21 July in Charters II (1999) 55: Don’t be bugged by what Cowley wanted put in [...] about ‘intellectualism’ of you & Bill & Joan as against Neal’s hard-on hungry purity.|
|Muscle for the Wing 98: Tell your hard-on brother what you seen over at Frechette Park.|