Smell off yer lack boy

exp.

Heard in Waterford

Probably the worst insult you can give a yungfella and will almost certainly lead to one getting "their go"... an appropriate response to this expression might be "Yer mudder!"

In use

Smell off yer lack boy, go 'way an' have a wash!

Posh English

There is a most offensive odour emanating from your person, young man; kindly go and bathe.