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 20, 2010
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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 03, 2014
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