freshers’ flu
n.— «Freshers’ Flu is a label used to describe the heavy cold symptoms—including headaches, cold sweats and a runny nose—experienced by many students in their first few weeks of university. It strikes at a time when students’ immune systems have been lowered by the social whirlwind of Freshers’ week, which is often characterised by late nights, excessive drinking and poor nutrition.» —“BUPA: How to blow the nose on ‘Freshers flu’” Politics.co.uk Sept. 11, 2007. (source: Double-Tongued Dictionary)
Further reading
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In a 1968 list of Cheyenne High School slang that ran in newspapers around the United States, Clyde, written like the man’s name, meant one’s head or mind. The Wyoming students’ examples included Use your Clyde! and put it out of your Clyde...