five head
n.— «The banter later switched to a discussion of who has the highest forehead, as measured in ordinary soup crackers. One and a half crackers is a high forehead; two crackers is next to bald. Henke was accused of having a “five head,” but had an answer for that. “I just have a tall face,” he said.» —“Crib and crackers diversions for Jays” Toronto Star (Canada) June 16, 1987. (source: Double-Tongued Dictionary)
Further reading
After an international team of scientists and staffers spent six months at a research station in Antarctica, their accents changed ever so slightly, according to an acoustic analysis by German researchers. The slang terms they shared include dingle...
Smoko, Australian slang for a smoke or cigarette break, also turns up at a British research station in Antarctica. It may have arrived with Australians working there, or it may simply have been handed from one wintering team to the next, the way...