To be in the process of doing an activity to the fullest extent possible. This phrase is often exacerbated by the saying "never on it softly" too add emphasis to the fact that this activity is never carried out in a half-arsed manner
Person 1. Are u on it hard?

Person 2. Am I on it hard? For fuck's sake of course I'm on it hard, I'm always on it hard, and never on it softly.
by rascal92 June 10, 2011
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"Last party we went to had a bunch of bitch-beers and no hard A."
by shackledxdollie November 20, 2004
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Long Dong Silver could never get a real hard on, because his penis was so long.
by Jorge December 06, 2002
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When the penis is aroused and expands to it's full length
Kiersten : Mmmmmmmm! Mmmmmmmm!
Chad : Mmmmmmmmm! Mmmmmmmm!
Kiersten : I do love kissing you Chad and it makes you get A Hard On would you like a blowjob?
Chad : Yes Please!
Chad : Ahhhhhhhhhhhhhhhhhh! Ahhhhhhhhhhhhhhhhh! Ahhhhhhhhhhhhhhhh!
Chad : You know this reminds me of the other day when me and Jim were kissing we got Hard On's and took turns sucking each other's dicks!
Kiersten : Reallly I just gave you an amazing blowjob and your going to talk about your gay experience with Jim.
Chad : I'm not gay I'm bicurious!
Kiersten : Well sounds like your gay to me!
Chad : I gotta go Jim want's me to take A shower with him!
Kiersten : GAY!
Chad: Bicurious!
by SlopNChop March 07, 2017
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