Pack dude

It just means, a noun that can be used in a number of different ways/phrases. Can also be used in a comedic sense, or when there’s nothing more to say.

Ex1: dude1 “hey did you hear what happened the other day?”
dude2 “yahhhh, pack dude”

Ex2: dude1 “could you imagine if that actully happens”
dude2 “ahahaha pack dude”