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Random
Getting an erection due to having to take a piss.
Similar to Morning Wood, except it happens while you're awake.
Ashley: Is that a gun in your pocket, or are you just happy to see me?
Cam: Neither; it's a piss stiffy.
A double stiffy is when two guys get an erection at the same time from the same female.
Damn bro, that was crazy last night. I can't belive we got a double stiffy watching Jennifer Aniston bend over on the set of the TV show friend's.
A brown stiffy is when a man preforms anal sex on a woman (or sir) and she poops whilst he is inside. This can be intentional or by accident.
Yeah man the other night I gave Rachel a brown stiffy.
moving weird, funny, 2 faced. Mostly used in some parts of England
This nigga is moving mad stiffy man.
This bish is stiffy bro
When you are depressed and jerk yourself off to try to make the pain of living go away.
I was about to kms last night so I just did a quick depressed stiffy to help
Stiffi can be something cool, or just a slag for a boner.
1. My new shoes are so stiffi!
2. Bro that girl gives me such a stiffi!