The old English term grockle refers to a visitor in a foreign land, for example "that Alanna from physics class isn't from here shes Irish what a Grockle".
After a brief trip to Northern Ireland, legend has it that after hearing a girl, referred to as 'groc' shout "mammy it's Baltic outside", Grock the clown found inspiration for his alias. This period is referred to as "The Troubles".