Literally, one who masturbates. Common usage typically refers to anyone of whom you have a low opinion.
eckham's a fuck-useless tosser.

Comment submitted with request to Delete: "I have copyrighted the word "Tosser" for my new adult entertainment film. Please remove it from your site or i will be forced to take legal action. May i suggest replacing it with the term "Wanker"."
by Anonymous March 18, 2003
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As far as I'm aware tosser has nothing to do with mastubation but comes from an old sailing term for a drunken idiot - 'he's a toss pot' - ie someone who drinks a lot is a tosser or toss pot.
by jane August 13, 2003
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A chiefly British derogatory term, literally meaning "one who masturbates," but properly used to describe anyone who is either incompetent, supercilious, or otherwise generally unpleasant. Tosser is a British synonym to the primarily American derogatory term, jerkoff, which is also used in the same manner as wanker and tosser.
Joe Sixpack: I'm going to need you to come in for work on Christmas Eve, Christmas Day, and New Year's, all without overtime pay.
Jolly Roger: Don't be such a tosser. I'm going to the pub with my mates on those days!
by FoxWing Mabon-Tail December 15, 2008
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used as an insult, calling someone a tosser is calling them 'an absolute retard'
Shut up you tosser!
by 1inABillion April 5, 2015
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Russian President Putin. Means a jerk off in American English. Also, British slang for male masturbation.
"Putin really is a tosser." Henry Smith, MP
by Pink Partner September 8, 2013
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