TDSU
n.— «I even survived unmolested the sharing of a tent on an ITC camp (ITC = Initial Training Corps) in Wales with a housemaster who was to go on to achieve notoriety at another public school for his near manic enthusiasm for TDSU beatings (TDSU = Trousers Down, Shirt Up).» —by John Peel Margrave of the Marshes Oct. 17, 2005. (source: Double-Tongued Dictionary)
Further reading
When you had sleepovers as a child, what did you call the makeshift beds you made on the floor? In some places, you call those bedclothes and blankets a pallet. This word comes from an old term for “straw.” And: What’s the story...
The emotional appeal of handwriting and the emotional reveal of animal phrases. Should children be taught cursive writing in school, or is their time better spent studying other things? A handwritten note and a typed one may use the very same words...