The phrase "monkeying with" is often used to describe someone who is messing around with or tampering with something. There are several synonyms for this phrase that can be used depending on the context of the situation. Some possible synonyms include tinkering, meddling, fiddling, tampering, interfering, and playing around with. Each of these words carries a slightly different connotation, but they all convey the idea that someone is engaging in a level of activity that may be disruptive or destructive. Whether someone is monkeying with a piece of technology, a system, or a relationship, it is important to be aware of the consequences and potential risks involved in such behavior.