look up any word, like blumpkin:
 
1.
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
 
2.
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
 
3.
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
 
4.
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
 
5.
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