The act of having intercourse with a female. Unlike regular sex or "punishin it", if you "pack it" you're bringing a whole new element into the game in that your shit hot (having plenty of experience) having sex and you don't quit until you say it's over. Additional you prefer to to go deep from the get go and you don't fuck around.
Bro 1 - Hey son what when you get back Tiff said she can't wait to get at you.
Bro 2 - Dayum I can't wait to get home and PACK IT booiiiii!!!!
Chick 1 - Hey girl I heard you got with Luis last night.
Chick 2 - Hell yeah he was packing it hard.
v: the imitation of the action to pack a dip by flicking your wrist to snap your forefinger against your middle finger with a *snap* - usually follows yelling, "Pack it!" as described above.
Player1: Dude, did you just see Jason lay that kid out!?
Player2: Hell yeah, I'll pack to that!
Player1: Pack it! *snap* *snap* *snap*
Source: tehb, Jersey
Dude, did you see me totally pack it face first on that last run? I think there's enough snow in my jacket to sustain a starving Ethiopian family for a week.