the state a guy gets when sexually aroused; penis fills with blood and stands straight up and often makes a bulge through pants; boxers, etc. especially embarrasing for teenage boys who are turned on frequently and can't seem to control their boners
by Drexelsage January 2, 2004
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Get the Stiffy mug.by xxdecayingashes December 26, 2004
Get the stiffy mug.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.
by Athena12 March 26, 2009
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