A fork of Rural Dictionary
An abandoned beer in a party or bar setting, particularly one which remains after the evening's festivities are over and is consumed by someone of lesser standards and/or means.
Usage apparently limited to a small circle of friends in the UMass Amherst area, late '80's through early '90's.
I was so trashed last night I was going around drinking slopers, even ones with cigarette butts in them.