Stiffy 

A mega-ass erection.

John: Why is your groin area protruding like that?
Bill: Oh, I just got a stiffy.

Stiffy by SwagMasta42069 May 24, 2018

Stiffy 

A boner or erection

Man, Billy got a huge stiffy.

Stiffy by MensWear June 15, 2018

stiffy 

(n)
1 an erection of the penis, Syn. boner, hard-on.
2 A strong drink, a double, esp. a double-bourbon-and-coke.
3 (South Africa) A plastic-cased 3.5-inch floppy disk, as opposed to the more flexable 5.25-inch floppy disk.

1 Oh man, I got a stiffy.
2 Gimme a stiffy and two pints.
3 Have you got a stiffy? I need one to save this file.

stiffy by Spootonium October 10, 2004

Stiffy 

A stiffy is an extended clip on a gun.

My gun has got a stiffy

Stiffy by Urban gang November 29, 2017

stiffy 

A slang term for boner or erection

While I was slow-dancing with Tom, he got a bulging stiffy. It was nasty.

stiffy by xxdecayingashes December 26, 2004

stiffy 

An erection.

I plugged her crotch-wound with my stiffy.

stiffy by urban pervert April 25, 2003

Stiffy 

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.

Stiffy by Athena12 March 26, 2009