Green’s Dictionary of Slang

of a person, despicable, second-rate, unimportant.

1997		‘Danger Overhead Junkie’ [poem] at cgsng.com 🌐 No relaxing for me, maybe a pub instead / Or headphones, / to drown out the noise of the tosser junkie overhead.
2000		J.J. Connolly Layer Cake 40: ‘Who was he with?’ [...] ‘Loada tossa footballers.’.