What does "squeaky" mean in slang?

In slang, squeaky has a few meanings, most commonly in the phrase squeaky clean, which means morally very clean, innocent, perfect reputation, law-abiding, with no bad record or dirt, as in he has a squeaky clean image or squeaky clean background check. Someone described as squeaky clean is seen as wholesome, pure, and without scandal. Another slang meaning comes from the idiom the squeaky wheel gets the grease, where squeaky means complaining loudly, so a squeaky person is someone who complains a lot to get attention or special treatment. In some contexts, squeaky can mean nervous, timid, or easily frightened, making small squeaks, similar to squeaky mouse. In British slang, squeaky can mean overly proper or prim. In car and mechanical slang, squeaky means something that needs fixing. There is also slang where squeaky bum time, popularized by football manager Alex Ferguson, means tense, nervous final moments of competition. Squeaky toy in slang can tease someone with high laugh. Overall, slang uses of squeaky revolve around clean, innocent, complaining, or nervous, with squeaky clean being the most widely used slang phrase meaning spotless reputation.