A Bum Savings Account is an old shopping cart, usually from Wal Mart or Value Village, that a bum has filled with bottles and cans to eventually cash in for a box of wine.
"Man, look at that. There goes another creepy homelessguy with his Bum Savings Account."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi