What is Ass Packer?
n. One who packs any object into his or any other mans rectal cavity. Generally one that is called an "ass packer" is known for engaging in intercourse with another male (i.e. fucking him up the ass) although the penis-to-anus contact is not necessary for one to be dubbed an "ass packer"
"Sam Compton is such an ass packer. He'll stick anything up there"
One who packs guys in the ass
Allen Hamilton is an Ass packer
One who packs another males ass, it's an insult so they don't really need to for you to call them it.
Someone calls you stupid...
You say, "Shut up ya stupid ass packer