The first money cheat in The Sims series of video games, until it was quickly replaced by "rosebud" in the expansions and sequels. Hearing it from someone is a fair indication that you're speaking to a real Sims veteran.
Used in Ylvis brother's video "The Cabin". Derives from the norwegian saying "det finnes ikke dårlig vær, bare dårlig _klær_". This saying has a rhyme to it, so when they sang it in english they made up the word kleather to make it rhyme.
Someone who has irrestible urges to take writing implements. Klepentomania is a common disorder, and its sufferers are frequently accused of being "pen thieves" when they can't help what they're doing because they are attracted to the ownership of the perfect pen.