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
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Lee in Charleston, South Carolina, remembers her dad used to refer to a blue patch of sky after a rain as kitten’s britches. Similar terms include Dutchman’s trousers, old woman’s apron, and cat’s vest, all suggesting that...