One who disrupts with the miniscule brain activity of a chav by asking them a simple question, usually entailing basic arithmetic or anything taught outside of kindergarten. Or, indeed, their date of birth or the identity of their biological father.
1980s British Midlands slang for lower-class undereducated teenagers and twenty-something 'men' sporting mullets, wispy moustaches, cardigans, Fred Perry shirts, stay-pressed trousers, white socks and slip-on shoes, plus sovereign rings and a pack of John Player Special cigarettes held nonchalantly in the tattooed hand. An embryonic chav.
"Went to the Ritzy last night and it was full of fucking yampies"