Definition & Meaning of "Gorbals kiss"in English

What does "Gorbals kiss" mean in Scottish slang?

The structure combines "Gorbals" (a district in Glasgow historically known for rough, working class poverty and toughness) with "kiss" (ironic, as this is the opposite of affectionate), forming a darkly humorous nickname for a violent act. It is used in Scotland, especially in Glasgow and surrounding areas, to mean a headbutt, typically delivered in a fight as an aggressive, close range attack. People typically say "He gave him a Gorbals kiss" or "A Gorbals kiss sorted that argument."