Green’s Dictionary of Slang

(US) a fool.

1997–2001		Online Sl. Dict. 🌐 tard n 1. term is a shortened form of retard. Can apply to the mentally retarded or just a stupid person. (‘You are a real tard.’).
1999		T. Fontana ‘Out o' Time’ Oz ser. 3 ep. 8 [TV script] Who’s he boxing? Another tard?
2001		‘Randy Everhard’ Tattoo of a Naked Lady 195: My eyes drifted down to myself dressed in that skunky ape suit and I felt like the biggest ’tard in the world.
2007		W. Ellis Crooked Little Vein 43: ‘I just thought it was, you know, a high-tech hinge.’ Trix smiled at me. ‘Tard.’.
2014		Twitter 29 July 🌐 Today I’ve been told I’m ‘an apologist for ’tards’ who is ‘siding with the dumb idiots’.