Snot fair
Featured in The Déise Dictionary
An expression used to describe how dissatisfied someone is with events dat have just transpired.
Daddy: "Go to bed now ye little mickey man!" Mickey: "Snot fair!"

What ho! Would you like me to translate 'Snot fair' in use for you?
'Off to bed with you now, you little rascal!' 'That is not fair!'
Any good?