dirty fintan 

Dirty Fintan, also known as Filthy Fintan is a phrase used to describe the action of slugging back a Pint if vinegar and slapping your wife across the face with your cock

Did you not see, Mina got a right dirty fintan at Chris’s New Years party!

dirty fintan by Orphanslayer69 April 18, 2020

Dirty Finnan 

The act of placing a bacon sandwich between a man's asscheeks and then eating said sandwich while the man farts. Licking the asscheeks and eating the ass is optional.

Her: "No, please stop asking"
Him: "Arr, come on man, lemme dirty Finnan ya"

Dirty Finnan by Bruhshchev September 2, 2021