BRITISH informal
a stupid or gullible person.
"they were no mugs where finance was concerned"
synonyms: fool, simpleton, innocent, dupe, gull; informal sucker, soft/easy touch, pushover, chump, noddle, dummy, dope, dimwit, dumbo, nerd, knucklehead, lamebrain, pea-brain, pudding-head, thickhead, wooden-head, pinhead, airhead, birdbrain; informal muggins, juggins, charlie; informal patsy, sap, schlemiel, pigeon, mark; informal dill; vulgar slang asshat