D.A. 어원

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] 

남성 고유명사로, Anthony의 축약형. Tony Curtis라는 스타일의 남성 헤어컷은 보통 뒤에 D.A.가 있는 형태로, 1956년에 미국 영화 스타 Bernard Schwarz (1925-2010)의 스크린 네임에서 유래되었다.