British slang with regional and contextual variations in meaning. Further to other definitions listed, doss can also mean...
1) A laugh; fun; a good time.
2) To sleep rough, usually on somebody's couch or floor but can also mean on the streets.
3) To freeload, particularly while receiving state benefits such as the dole (Jobseeker's Allowance).
1) "We went out last night, got pissed-up and had a right doss."
2) "Shit, I've missed the last bus home. Do you mind if I doss on your floor?"
3) "I quit my job and spent the whole summer dole dossing: just skateboarding all day and partying all night."