What is Trash Corn?
1.
Some movie theaters allow one free refill on large popcorn. By fishing a bag out of the trash, you can get some for free (they give you a new bag that says "refill"). Popcorn acquired in this fashion is called trash corn.
Before the movie, me and Bob looked through several trash cans trying to find a bag so we could get trash corn. Alas, the garbage had just been taken out.
See
