A person who spends considerable time in indoor pursuits, such as computing, sleeping and watching sports on television.
"Sean, an avid indoorsman, is highly regarded for his skill at video games and computer programming."
by Sean Boots January 26, 2004
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An Introvert who prefers video games to partying.
"What better than playing games and enjoying the luxury of your house ?" says an indoorsman.
by Tramp120 November 9, 2009
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Noun, slang.

1. A person, most commonly a millennial, who is a gamer, whose great life experiences are almost exclusively indoors, and often defined primarily in terms of virtual explorations, such as those in the video games Super Smash Bros. and Monster Hunter. A "great indoorsman" could simultaneously be one of two Smash Bros.

2). A person, most commonly of the nerd varietal, who could go outside, but chooses to spend 99.99% of his or her time inside, often stewing in a pile of his or her own filthy and odorous laundry.
Friend: Are Logan and Jeremy going to the bonfire tonight?
Other friend: No, those great indoorsman are going to hang out in their room to game like fiends until their thumbs bleed.
by Definerator November 19, 2016
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A person who stays inside Harry's Chocolate Shop (A bar at Purdue University) from open (11:30am) to close (3:00am). Harry's Chocolate Shop is the home of the saying "Go Ugly Early"... a saying used to get into the former speakeasy in the basement.
The aeros at purdue organized an event and many became considered the great indoorsman.
by peacedout December 6, 2010
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