look up any word, like the eiffel tower:
 
4.
An erect penis,usally gotten through sexual arousal.
We all know Paris Hilton sucked her boyfriend Rick Solomon's stiffy,weird lighting there too.
by Dude_75 March 14, 2006
 
1.
(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.
by Spootonium October 10, 2004
 
2.
A slang term for boner or erection
While I was slow-dancing with Tom, he got a bulging stiffy. It was nasty.
by xxdecayingashes December 26, 2004
 
3.
An erection.
I plugged her crotch-wound with my stiffy.
by urban pervert April 25, 2003
 
5.
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
 
6.
When you get a sudden rush of blood to your old man when you see a picture of a woman ass, tits, and fanny
by Jeffery Sylivester January 31, 2003
 
7.
A name given to a 1.44MB data disc to differentiate it from a 360MB "Floppy" data disc.

Not used outside South Africa to my knowledge.
To a secretary: Can you give me a stiffy?
by Derek Blount April 15, 2008