IQ reducer 

Baseball cap, worn sideways or backwards. Instantly giving the impression of the wearer being even less intelligent than they might look if they weren't wearing it. Often in Burberry check pattern.

Bert: Observe the chav with the IQ reducer and GTI parked outside the bank. Clearly a cash point cripple

Gert: Tosser

IQ reducer by bushwacka1973 June 21, 2011