An email account specifically used for the purpose of collecting spam emails. Generally used as an alternative to one's main email address to keep spam from cluttering it up, while the "spam bucket" address is used for such things as signing up for things online that require an email address which one knows will generate spam.
"I hate signing up for those free porn sites because they make you give them your email address and then send loads of spam to it. So I just made a spam bucket so I don't have to weed through my main address to find my real mail."
Pirate ship captained by Sir Spam
pirate #1: thats the dreaded spam bucket!
pirate #2: quick! get out ze spam to give to the cap'n!