drop-dead

drop-dead (not comparable)

1. (informal) Very impressively or spectacularly.

   My date was drop-dead gorgeous!

2. (informal, not comparable, of a point in time) Absolutely final; being the deadline.
   • 2003, Joseph W. Bartlett, ‎Ross Barrett, ‎Michael Butler, Advanced Private Equity Term Sheets and Series A Documents

     The intruding investor (VC #2) makes an offer at a pre-money valuation of $15 million, subject to due diligence, and the expiration of the "drop dead" date, meaning the date in the initial investor's term sheet when exclusivity expires.

   • 2010, Richard L. Daft, The Executive and the Elephant (page 96)

     As the drop-dead date approaches, my mind becomes more focused.

• drop dead

• dead drop, dead-drop