armchair warrior 

someone who has never served in the military, but who rah-rahs a war when it is broadcast on TV from his armchair while swilling beer. He thinks it is all a game to watch and he buys items (like T-shirts) that celebrate the war and are sold by oily corporate yuppies who want to make a few bucks off a national wave of "patriotism". Armchair warriors call that "supporting the troops" but do not think at all about the dangers inherant in war and do not want to lift a finger to help returning veterans get rehabilitation or treatment for their disabilities. They just want to see the modern day TV gladiators "kick some ass" for their amusement. They are SMFs.

Senator Bonehead voted for the war. He never served in the Armed Forces, he claimed that all the "minorities" and "little people" were doing the job for him. Every night he goes home and watches the news to see how many enmy combatants are killed. He cheers the U.S. forces on for "kicking ass" while chugging down his beer. He is a prime example of an armchair warrior.

armchair warrior by I Saw U2 Live Twice November 6, 2008

Armchair Warrior Disorder 

Those who ferociously post inane arguments from their armchairs.

Farah has armchair warrior disorder, he spends all his time online defending inane political arguments that go nowhere.

Armchair Warrior Disorder by Åmiña Åhmëd August 27, 2012