look up any word, like b4nny:
 
1.
(1) adjective: meaning nothing or empty. Used by a specific World History teacher many times, and still gets a laugh from the naive children.
(1) "The Soviets had no idea that we were coming. They knew jack taco."
by THE ALL KNOWING AMY May 05, 2004
 
2.
empty, containing or meaning nothing
Dude, we ate all of the pizza, there's jack taco left.
by Sarah March 10, 2004