Being teddibly adult and program correct, he said, "I don't know how shit feels."
"It's an acronym," I said. "It stands for Sore, Headachy, Infirm, and Tense."
Curiously enough, "SHIT" originally was an acronym standing for "Store High In Transit." In the days when fertilizer was shipped in leaky wooden boats, getting the stuff wet could have rather explosive effects. So, longshoremen were instructed to load the stuff in the ship's upper reaches. "Store High In Transit" became abbreviated to "S.H.I.T.," and the rest is history.
There are many program acronyms attempting to make it easier to remember a slogan, some fact or guiding principle, such as the familiar "KISS" = standing for, "Keep It Simple, Stupid."
Here are a few others that have been sent to me by Twelve Step program members over the years: