The guy is shocked when he finds out what the jamaican guys’ tattoo says

A guy decides to do something nice for his girlfriend before they leave on vacation so he gets her name tattooed on his penis.

He comes home and shows it to her. 

She looks at it and says, "That's great, sweetie, but what is 'Wy'?" 

He tells her to rub it, and as she does she sees it actually reads "Wendy." 

When they arrive at Montego Bay, the couple are walking along a nude beach and the boyfriend notices a jamaican guy with "Wy" on his penis. 

He asks the man if he also has a girlfriend named Wendy.  

The jamaican guy laughs and says, "Nah, mon, mine says 'Welcome to Jamaica have a nice day.'"