What is Beer Jacket?
The invisible coat you where over your tshirt/short sleeve/bare chest when walking home on a freezing night out without feeling the cold.
"Aren't you cold?"
"No i'm wearing my beer jacket!"
The ability not to feel the cold when drunk. Also know as a
"You must have been freezing last night walking home?"
"I didn't feel it. I had my trusty beer jacket on"
the lack of a need for a real jacket due to the warming effects of alcohol
dude are u not cold?? no ive got a beer jacket on!!