It usually occurs when someone usually English or from Edinburgh annoys the indigenous Glaswegian. The indigenous Glaswegian will take offence at Englander/Edinbugger and swiftly head butt (Kiss) him usually causing the minimum damage of a broken nose, in some extreme cases a Glasgow Kiss has been fatal but for it to be that lethal the recipient has to be an ultra-effeminate Bag of Scottish Shite, Scottish.