Fill Or Kill - FOK

What Does Fill Or Kill - FOK Mean?
An order to fill a transaction immediately and completely or not at all.

Investopedia explains Fill Or Kill - FOK
This type of order is usually for a large quantity of stock, and must be filled in its entirety or canceled (killed). Examples include market and limit orders requiring immediate execution. In reality, the fill-or-kill type of trade does not occur very often.