When a guy pours peppermintessential oil on his thumb and sticks it up his partners butt. He then extracts his thumb and rubs it underneath his partners nose and across the upper lip.
Chris awoke to the rising sun. He looked over at Nathaniel sleeping peacefully. With out waking up Nathaniel Chris gathered his things and exited the room. As he was leaving the strange house Chris had this uncomfortable feeling as if he had done something, dirty.
When Nathaniel awoke he realized he had been giving the dirty goodbye.
To do 'The Dirty Guinness' one must down one's pint of Guinness then continue to thrust said empty pint glass into ones face, shattering it in the process.
Paddy O'Halloran: I can't make it into work today boss.
Boss: Why might that be Paddy?
Paddy O'Halloran: I only went and did The Dirty Guinness a few times last night, it was Finlay's stag do!
Boss: Good lad Paddy, I'll be seeing you tomorrow then.