Glasgow Caipirinha

The act of filling a glass or cup with urine and throwing it onto innocent passers-by.

A common pastime in the dreary city of Glasgow, probably caused by the lack of sunlight and too much Irn Bru.

"Sir did you just throw urine in my face!?"
"Aye, haud yer wheesht, wee eejit!, Glasgow Caipirinha!"