1. The act of carrying a firearm on one's person.

2. When a person is well-endowed. Male: Used when referring to a man who has a large penis. Female: Used when referring to a woman who has large and shapely breasts and/or a large and shapely ass.
"Girl, did you fuck him? Is he packin heat?"

"That girl is stacked up, she's packin heat."
by The Cracka Atacka December 30, 2009
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To have a bigger dick than your size suggests.
Mike: Hey man I saw this short old armenian dude buying two boxes of magnums in 7-11 the other day.
Jason: Holy shit, either he's sellin' condoms to the bruthas on the street or he's packin' heat.
by Michael Whalen December 13, 2007
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An increasingly popular scooter gang located in Chicago, IL. Members are typically known for riding with a slight buzz to Cubs games, local pubs and street festivals.
Are you riding with Packin Heat this weekend?
by Trent Hoffman April 22, 2008
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Doing a girl while wearing a condom covered in Icy Hot.
"Dude, how did you break up with your girlfriend so easy?"

"Last time we fucked I was packin' heat; never heard from her again."

by Dwight Fart Schrute May 16, 2007
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