Making sure you have a condom with you before going out for a night of drunken debauchery when it is more likely than not that you will end up hooking up with some skeezy rotten-crotch at the end of the night.
Chance: "Yo G. You packin' heat tonight?"
Hunter: "Fo real B. Last weekend I ended up bare backin' that nasty bander-snatch and had to go to the clinic on Monday to get my shit checked. You bet your sweet nuggets I'm packin' heat from now on!"
A deal breaker between two people attempting to form a relationship.
To have kids/be a parent
A mom or dad/father or mother
Someone with kids
Friend: Girl, that guy at work is hot!
Other Friend: I'm sorry but I'm pretty sure he's packin' heat.
Person A: I met the most amazing guy the other day, I know we're soul mates for sure.
Person J: Do I know him?
Person A: Yeah it's C from Giant Eagle
Person J: Oh my god, he's packin' serious heat!
Person A: Aw man, forget that!
adjective; to describe someone
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.
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."