Manky

adj.

Heard in Dublin, Meath, Kilkenny, Cork, Limerick, Longford and Wexford

Very dirty/unpleasant. Also: Means dirty or unclean.

In use

What is that manky smell?" "Yer man fell into a ditch and his bleeding manky

Posh English

What on earth is that thoroughly unpleasant smell?

Same phrase, other counties