To take possession of beer left in your fridge for over a week. Typically done with beer left over from a party.
Brad: Dude, where'd my beer that I left from that party two weeks ago go?
Blake: After one week of being left in my fridge I commanbeered it and drank it.
Commanthe is a mysterious and elusive creature, only a small few know if it's existence, while others know it by it's more common name ", the". Originating in Scotland, if has been suggested it will soon be migration to China.
Chris cracked the last beer at 7am, and fell asleep soon thereafter. Kevin woke up at 9am and realized the folly of Chris' ways and politely commandbeered him as to not let sweet, sweet beer go to waste.