Carrickfergus (aka Carrick) is a town in Northern Ireland which is beside the sea and has a large number of pubs and hairdressers and banks and butchers and chap shaps and hoods and big girls and prodestants and painted kerbs, like.
Jonty 1: I wish I was... in Carrickfergus...
Jonty 2: No you dont mate, it's well shiiiiite.
a very large penis
"Damn, bro. You've got quite the Carrickfergus. *whistles appreciatively*"