A Wiss is a portmanteau of Wimp and Piss...
The Word means a "Wimp who drinks Piss"...
This is the sort of albatross that gets
hung around the
neck of somebody who is bullied and then supposedly made up with by being bought a beer. Said beer, however, happens to have been dosed liberally with piss... This happens after the victim has been gotten
drunk enough not to be able to prevent this from happening...