muggins

noun
noun

1: A fool, simpleton. (1705 —) .
Daily Telegraph The letter bomb was not meant for me personally. I was just the muggins who opened it (1973).

2: Used to refer self-deprecatingly to oneself as someone easily fooled or imposed on. (1973 —) .
E. Lemarchand 'In a nutshell,' Michael said,'... Muggins [i.e. himself] has agreed to be in charge' (1973).

[Perh. from the surname Muggins, with allusion to mug² noun 1a.]

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