English version

thicko

From Longman Dictionary of Contemporary Englishthickothick‧o /ˈθɪkəʊ $ -koʊ/ noun (plural thickos) [countable]  British English spokenSTUPID/NOT INTELLIGENT someone who is very stupid
Examples from the Corpus
thickoLysander, her hero, is a lovable thicko who isn't even terribly proficient in bed.
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