Wiktionary
thicky
n. (context UK slang English) an idiotic person.
Usage examples of "thicky".
I was some kind of nympho with a costume fetish, that my job was laughable, that Isobel and I were Thickie and Thickier, barely able to keep up with their not-so-clever quips and implications.
I did for the man in his cups, he be swearing his soul away I mussed up thicky dart with prussic acid.
I goes to thicky cupboard which Nick Harper has played the fool with, mucking round with his cameras and squirts of powder.