Sailor Mouth

"Sailor Mouth" is a SpongeBob SquarePants episode from Season 2. In this episode, SpongeBob learns a bad word on the dumpster behind the Krusty Krab.

Plot
The episode begins when the Krusty Krab reaches closing time and SpongeBob is about to leave, but is ordered by Mr. Krabs to take the trash on his way out. When SpongeBob goes around to the back of the restaurant, he peruses some of the dumpster writing, eventually finding one passage in particular reading "Krabs is a..." As SpongeBob reads the last word, which is censored via a dolphin sound, a nearby garbage man is disgusted at his usage of the word to the point where he asks SpongeBob if he kisses his mother with that mouth. Confused, SpongeBob repeats this new word to the arriving Patrick, who explains that it is a "sentence enhancer" used in refined conversation. They begin to repeat it to themselves and use it in conversations.

The next day, SpongeBob walks into the Krusty Krab using the word and the customers are shocked. SpongeBob greets Patrick with their new word and he does the same. SpongeBob then shares the word with everyone else over the intercom. The Krusty Krab customers are appalled by what they hear and leave. In the bathroom, Mr. Krabs is alerted to the empty restaurant and rushes out. Squidward explains that SpongeBob and Patrick have learned a new word and SpongeBob said it to the Krusty Krab over the intercom, causing the customers to leave.

Mr. Krabs asks what SpongeBob and Patrick's new word was and Squidward explains it. Mr. Krabs sternly informs them that their new word is not a sentence enhancer that is fancy talk: it is actually an expletive that is the eleventh of thirteen vulgar words that should never be uttered as they are all bad words. SpongeBob and Patrick wipe the expletive from their tongues and promise Mr. Krabs that they will never use it again.

Later, at SpongeBob's house, SpongeBob and Patrick play a game of Eels and Escalators. Patrick keeps moving up escalators while SpongeBob gets sent down the eels. After losing the game, SpongeBob accidentally angrily shouts out the expletive they promised not to say. Patrick then races to the Krusty Krab to tell Mr. Krabs, while SpongeBob tries to stop him. During the chase, Patrick repeats the swear word, giving SpongeBob the excuse to tell on him instead. Thanks to Patrick's detour aboard an ice cream truck, SpongeBob reaches the Krusty Krab first and rushes to Mr. Krabs. However, SpongeBob cannot get to the point, giving Patrick time to catch up and add to the clamor. Eventually, Mr. Krabs commands them to spit out what they mean to say, which turns out to be the bad word.

Enraged, Mr. Krabs takes SpongeBob and Patrick outside and tells them to wait. Fearing their upcoming retribution, the two friends apologize to each other and vow to strike the word permanently from their lips. Mr. Krabs returns with cans of paint for them to give the Krusty Krab a fresh coat of as punishment. However, he hits his foot on a rock, and in his pain, he shouts all thirteen expletives. Once SpongeBob and Patrick tally the curses, they run to Betsy Krabs' house to tell on her son while he chases after them to stop the pair. As Betsy answers the door, she is greeted by a cacophony of swearing from all three of them, causing her to faint.

Mr. Krabs reprimands SpongeBob and Patrick for using such salty language in front of his mother. However, Mama Krabs quickly regains consciousness, scolds all three for their sailor mouths, and sets them to work painting her house. After some time, she decides to reward them with some lemonade. On her way to get it, she hits her foot on a rock and shouts in pain. What they take to be a bad word, however, is actually the car horn of Old Man Jenkins' jalopy, with Jenkins greeting Betsy, giving them all a good laugh and ending the episode.