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Meaning a geeky or bookish boy, particularly used in the case of maths enthusiasts. Derivation from the word bumberclat, but with no real link.
'That boy is such a numberclatt, he got 100% on his algebra test!'
by Ukinkilops September 09, 2008
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Words related to Numberclat

bumberclat geek nerd numberclatt retard zain