A man who likes to give it to people in the rear (i.e. in their budge). Also can mean a man who is a real bastardly douche-bag, and who screws people over all the time. (i.e. synonymous with fudgepacker). Budgepackers frequently seb.
"I just finished the test, and it was really unfair. That professor is a budgepacker."
"I did a guy a big favor, and he turned around and shafted me. He is a real budgepacker."
I walked in on a budgepacker seb-ing another guy."
"You are giving me a stockham stiffie, you budgepacker."