Glasgow kiss
n.— «Compared with its great rival, Edinburgh—the twee Scottish capital that’s only a 45-minute drive away—the city has progressed from being the spiritual home of the head butt (also known as the “Glasgow kiss”) into a vibrant, trendsetting hub.» —“Glasgow’s new glow” by John Lee in Glasgow, Scotland Globe and Mail (Toronto, Can.) Apr. 23, 2005. (source: Double-Tongued Dictionary)