The phrase "skins alive" is often used to express extreme anger or frustration, but it has several synonyms that could be used to convey the same sentiment. Some similar phrases include "rip someone a new one", "tear someone apart", or "give someone a piece of your mind". Other options include "lay into someone", "let someone have it", or "go off on someone". These phrases all suggest a level of anger or frustration that could lead to confrontational or aggressive behavior. It's important to remember to communicate assertively rather than aggressively, as the latter can often lead to unnecessary conflict.