A Dirty Shaymus is when you put your bong into someones asshole and light a bowl while the recipient sucks in with their ass. After the bowl is finished the recipient farts out the smoke and the person who lit the bowl sucks the air out of the asshole.
Shrayus is baby boy name across all regions in India. It is different spelling of Shreyas in some region of India. It is a Sanskirit name meaning Superior, Virtue or Most Excellent.
Having sexual intercourse with someone while playing the bagpipes. This does not usually attract many bystanders therefore it is useful when wanting some privacy
You should have heard it, my parents were doing the UncleShamus last night, I had to get out of there