(1) Word: Barnburner

(2) Source of Word: Dictionary.com [Word of the Day]

(3) How the word was used:“So, ready for the elder's meeting tonight?” Olan said, pouring himself some coffee. “Should be a barnburner from what I hear.” 

(4) Definition:  Something that is highly exciting or impressive.

(5) My sentence: The party is going to be a barnburner.