Phné
<f-nyeh> A word used as a substitute for another foul mouthed word such as shit, cunt, and fuck, in case of a family friendly atmosphere. It can also be used as a substitute for any other word of the speaker's choice. It is often used among friends as a way to fuck with people who aren't aware of the word and its uses, as an inside joke.
Hey Ernie, you've got a little phné on your shirt man, haha you're such a phné.