I know some Japanese due to my martial arts training. I saw a girl walk past me at a basketball game at UNC Charlotte a couple months ago with a Japanese symbol on the back of her right shoulder. I asked her what it meant. She said it meant "sexy".
I saved my laughter until she got out of earshot. She probably still doesn't know that she has the equivalent of "swine" or "dirty pig" written on her back. Tattoo guy obviously got tired of writing lies on fat white chicks and decided to have some fun :-)
One Chinese American tatooist got into major trouble for doing just this in Texas last year (he got sent to prison because it is actually FRAUD to give to customer something they didn't want :-))
He'd put on the skin:
"Dumbass Laowai"
"Cheap whore"
"Pig"
"Faggot"
"Fat pig"