1 definition by JGPresley

Top Definition
An erection on a 50 year old man. Combination of the words "fifty' and "stiffy". stiffy erection

A discussion among friends about the pros and cons of turning the big 5-0 produced this term.
Steve may be half a century old, but he can still give his wife the ol' stifty.
by JGPresley December 28, 2010

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