A time when a person or object that once had immunity (or in the very least was fast enough to avoid) is no longer able to avoid what they deserve.
"Don't you worry... when I tell your mom what you've been doing it's open season on your ass."
by Mr.FHero.Esq March 04, 2019
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When alll the girls you and your friends have a sexual intrest in and or dating become open for any random jobber to bone.
Dude, since its fuckin open season, I went and fucked the fuckin roast beef out of evan's women.
by Dan Maslanka March 15, 2005
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A Fucking Hilarious Animated Movie Starring Martin Lawrence(Boog) and Ashton Kutcher(Elliot)

Boog, a domesticated grizzley bear with no survival skills, has his perfect world turned upside down when he meets Elliot, a scrawny, fast-talking mule deer. They join forces to unite the woodland creatures and take the forest back into nature's control!
Open Season is Hilariously Witty And Absolutely Entertaining!

- Film Advisory Board
by Seagulls of Satan July 31, 2008
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The Part of the Year when it is both Legally, and Ecologically, Acceptable to Hunt for Animals,Fish or Game, of a Particular Species.
All the (civilised) Local National Governments set Start and End Dates for the Open Season; and the Closed Season.
These dates can be different for each of the Animals, Fish, or Game Species which a Hunter/Angler wants to target.
In Order to Avoid Being Caught, Arrested and Fined, it is necessary to Find out what the Start and End Dates are for the Open Season; as it applies to the Species of Quarry which YOU want to Hunt.
( The Survival of Species is At Stake; So Don't Risk Being Busted.)
The Fines are, Quite Rightly; VERY PAINFULLY EXPENSIVE.
by Cyril Squirrel April 09, 2007
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the act of lifting someones shirt and slapping them in the back with both hands. Most effective when performed with an accomplice. obviously it must be a surprise to the victim for maximum hilarity.
Dude, did you just see Danny open season Keith Edie into those lockers? He cried.
by reid sellen January 05, 2008
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the act of lifting someones shirt and slapping them in the back with both hands. Most effective when performed with an accomplice. obviously it must be a surprise to the victim for maximum hilarity.
Dude, did you just see Danny open season Keith Edie into those lockers? He cried.
by reid sellen January 05, 2008
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Noun. The first girl you fuck after a streak of not getting it in for a long time. Usually a fugly girl who you wouldn't normally fuck, but do so anyway out of the necessity to warm up and get back in the game.
Subey: "Moustapha, you should fuck Moby as a season opener because you haven't been able to get it in since the accident and you need some practice, yeah?"
Moustapha: "Oh Hell yea. Usually I'm repulsed by her because she's a big girl, but I have the biggest boner now just thinking about her. I'll seduce her with my new Ralph Lauren scarf."
by Krazy K 69 February 11, 2014
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