A pickle is a green cucumber that has been pickled in a brine, vinegar, or other solution and left to ferment for some time. They are most often sliced into individual pieces and added to sandwiches.
Role in series
While SpongeBob lists Krabby Patty ingredients, pickles are one of them, and are shown in real-life representation of a Krabby Patty.
Pickles are the driving point of this episode. SpongeBob is reminded by Bubble Bass that he forgot to put pickles on his Double Triple Bossy Deluxe, which destroys his memory of how to make a Krabby Patty, let alone do anything.
Toward the end of the episode, it is revealed by SpongeBob that Bubble Bass had been hiding the pickles under his tongue the whole time, among many other belongings of the Bikini Bottomites.