The guy in your group of friends that takes the grenade.
"who takes the grenade this time?"

"Kevin hes the flak jacket man."
by nickwithkungfugrip August 21, 2010
Get the flak jacket man mug.
A rancid layer of fat and body hair, providing warmth to men in cold climates. Also a bitch of a curse for any man wearing one above 55°F.
Chris Farley's Man Jacket mad him sweat like a steamed pig on SNL.
by Hard Rooster July 3, 2014
Get the man jacket mug.