Jamackan

Someone who adopts a fake Jamaican accent or appearance in an attempt to change their image or seem Carribean/mellow/hip/etc. This should not be confused with those who honestly accept such Jamaican qualities honestly, this term applies only to posers.

Snoop Dogg changing his name to Snoop Lion is such a Jamackan move, man.

or

Miss Cleo was born in LA, she's a total Jamackan.