The act of wearing a sweater without an undershirt. This unorthodox practice is normally observed amongst women but can be seen on men as well.
Look at that girls cleavage!

I love when she goes sweater commando.
by Kpeng January 6, 2017
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an intoxicated yet fearless individual, usually brandishing a weapon (Buckfast Bottle, which they have just drank)
Buckfast Commando: "Wit you lookin at ya fanny?"
man on the street: "sorry mate, dont want any trouble!"
Buckfast Commando: "Too late yur gittin chibbed!"
by Bullcoh February 23, 2009
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Somebody who collects weapons, usually knives, guns, and swords, and talks a lot about warfare, violence and the the like. Has never actually fought in a war, or been in the military, but loves the two subjects. Fantasizes about being a navy SEAL or a federal agent. Usually a giant pussy when the shit actually hits the fan.
Greg: "Aw man, I wanna be a Navy SEAL soooo bad. Because they have the biggest variety of weapons to choose from. I just bought a shotgun with a pistol grip, so I'm already in training."

Kyle: "I'm gonna punch you in the face you armchair commando."

Greg: "Please don't! What did I do! No, stop! I'm sorry!"
by Lupara2012 July 29, 2012
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Someone who acts tough behind a keyboard online, but can't say the same things in real life.
Keyboard Commando: 'That's complete shit! You're wrong! If I saw you in the street, I'd bash you!'

Real Life: 'Oh ... Hello ... Of course you are right and I am wrong. Sorry ... I won't disagree with you.'
by Papewaio March 3, 2010
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Going commando (pantyless) in a micro-skirt or see-through dress.
Britney went ultra-commando and got caught by the paparazzi.
by jammygoil December 3, 2006
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