「 D.A. 」の語源

also rat-fuck, ratfuck, c. 1956 as "hijinks or trouble, especially in a campus setting," according to American Speech (October 1965) where it was said to be "a widely used slang term at Stanford" and often abbreviated "R.F." (Compare D.A. from around the same era.) Perhaps it is related to slang rat fink, which emerged about the same time.

Specifically as Philadelphia rat-fuck for "a big, elaborate, and really terrible social event."

This sort of event has a name, coined by the late Marie Harriman, the dazzling second wife of statesman Averell Harriman. It is called a "Philadelphia rat fuck"—"P.R.F." or "rat fuck" for short. (This is definitely a challenge for the illustrator of this book.) [Sally Quinn, "The Party: A Guide to Adventurous Entertaining," 1997] 

男性の固有名詞で、Anthonyの短縮形。Tony Curtis、男性の髪型スタイル（通常、後ろにD.A.があるもの）は1956年から、アメリカの映画スターBernard Schwarz（1925-2010）のスクリーンネームに由来する。