Green’s Dictionary of Slang

tosspot n.

a fool.

[1902		Truth (Sydney) 13 July 8/2: [headline] Tosspot Toby’s Tippling Trip].
1941		P. Larkin letter 23 June in Thwaite Sel. Letters (1992) 17: These men are shit-pans, come-pots and toss-bottles.
1943		R. Llewellyn None But the Lonely Heart 98: You’ll be paying for our suppers in the bargain, me fine fat tosspot.
1959		I. & P. Opie Lore and Lang. of Schoolchildren (1977) 274: Then ‘Old Paddy from Cork’, and lastly ‘Old Tosspot.’.
1963		B. Hecht Gaily, Gaily 114: Your Gypsy Toss-Pot is bound to turn up with some ambulance-chasing lawyer and make a grab for the Chatfield millions.
1978		S. King Stand (1990) 207: The year-round residents always had to have someone to look at – a tosspot, welfare slacker.
1989		T. Blacker Fixx 305: Some tosspot freebasing in the library.
1999		Guardian G2 14 July 9: Thanks for moving over, tosspot!
2004		P. Howard PS, I Scored the Bridesmaids 129: This tosspot called Trevor, we’re basically talking Graham Noton in orange leggings.
2012		J. Fagan Panopticon (2013) 51: I ask it politely but they dinnae answer — fucking tosspots.
2016		Eve. Standard (London) 24 June 5/4: I might go and punch him because he’s a tosspot.