John: Why is your groin area protruding like that?
Bill: Oh, I just got a stiffy.
by SwagMasta42069 April 11, 2018
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A stiffy is an extended clip on a gun.
by Urban gang November 29, 2017
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A slang word for erection or hard-on. As an erection is the 'stiffing' of the penis, a 'stiffy' is an understandable slang word. Normally used by children first discovering sexual things.
Ethan and I were discussing sex and he got a stiffy from thinking about it.
by Athena12 March 26, 2009
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The most awesome nickname ever. This person is probably the coolest person walking on earth.
And most most certain; drop dead gorgeous, since he/she is compared with a boner.
-Oh, have you met stiffy?
-Yes she gave me a stiffy
by My nickname is Stiffy September 3, 2012
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Often Used In The Bronx , Stiffy means A Gun Or a Gun that cannot be traced
Blicky got the Stiffy

Aye man you selling a Stiffy

Everyone on this block got a stiffy
by KingPinNumba3 October 28, 2017
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When a male's dick is hard and sticks up.
"Man my dick is hard, I think i have a stiffy"
by Anonymous PLIES LOVER June 12, 2009
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