Me·gil·lah 
(mə-gĭlə)
(mə-gĭlə)n.
1. Judaism The scroll containing the biblical narrative of the book of Esther, traditionally read in synagogues to celebrate the festival of Purim.
2. megillah Slang A tediously detailed or embroidered account: told us the whole megillah.
[Hebrew məgillâ, scroll, from gālal, to roll; see gll in the Appendix of Semitic roots.]