It is a slightly taller Krabby Patty. Its name is a pun on how onions make people cry when cut, and as such, the Crying Johnny has extra onions. Due to this, it is larger than the original Krabby Patty.
Role in episode
This is what Clay orders at the beginning of the episode.
Role in SpongeBob Moves In!
This is an unlockable food item that can be made at the Krusty Krab.
In SpongeBob Moves In!, the extra onions can be seen on the burger, but in "Pickles," they cannot.