There seems to be some confusion on which language is acceptable and which isn't. This should explain.
Language that is acceptable: Language such as "Darn, Heck, Fart, Butt, Rats etc" is not polite but not profanity, and therefore is acceptable. Such G-Rated language is allowed if you are just exclaiming or describing some character or situation, but if you use the words that are possible to do so to target another user it would lead to warnings and later blocks. And of course normal nouns (truck), verbs (walk), adverbs (wisely), adjectives (small), and words we basically need to use such as it and the are OK. So are proper nouns.
Language that is more or less no: "Idiot, Moron, Jerk" and other insults are okay if you use them to describe a character. If you use them to insult a user, they become offensive. If you use this far too much, and exclusively to attack users, you will be blocked for six months. Another example is mild profanity such as "Damn, "Hell" and "Crap", as these words are not highly explicit. Forgive me if you think I am allowing profanity but this is not profanity. But, if you use it to attack other users or are vandalizing an article with them, you will receive a warning and then a block for six months. If such language is used in the book, it can be used in this wiki. In some rare cases, PG-13 language is okay-ish under certain circumstances.
Language that is under no circumstances acceptable: Forgive me, as I do not use it openly but you will get blocked if you use it too much. Use of explicit profanity will get you a warning and then blocked for a year. Such NC-17 or X-rated language is bound to get you blocked if you use it. Also, no hate speech or pornography.
Nonsense words: A common form of vandalism is using gibberish text to flood an article. Though not inappropriate, such gibberish words block up the article and therefore are not permitted. An exception to this rule is relevant non-dictionary words such as "Drummies, Zoo-Wee-Mama, Bubby, Ploopy and the characters' names. They can be used in context.