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"
"When Mike told the waitress that all 20 people watchingthe game would be on one tab, I set up my own tab with the bartender. I wanted no part of the assfuckery that would happen when it came time to divy up the check."