a lengthy, detailed explanation or account: Just give me the facts, not a whole megillah.
b.
a lengthy and tediously complicated situation or matter.
2.
(italics) Hebrew. a scroll, esp. one containing the Book of Esther. Others are the Book of Ecclesiastes, the Song of Solomon, the Book of Ruth, and the Book of Lamentations.
Also, me⋅gil⋅la.
Origin: 1950–55; < Yiddish megile lit., scroll < Heb məgillāh
n. a long and complicated story. (From Hebrew megillah via Yiddish.) : Here you come in here with this megillah about a flat tire and how your brother-in-law stole your jack and how your arthritis is kicking up—what do you think I am, some sort of shoulder to cry on?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
megillah
"long, tedious, complicated story," 1957, from Yiddish (e.g. a gantse Megillah "a whole megillah"), lit. "roll, scroll," name of the five O.T. books appointed to be read on certain feast days. The slang use is in ref. to the length of the text.