Etymology
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tosser (n.)

term of contempt in British slang, by 1977, probably from slang toss off "act of masturbation" (1735). Agent noun from toss (v.). Compare jerk (n.).

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Definitions of tosser

tosser (n.)
terms of abuse for a masturbator;
Synonyms: jerk-off / wanker
tosser (n.)
someone who throws lightly (as with the palm upward);
From wordnet.princeton.edu