The phrase "monkeyed with" generally refers to the act of messing around with something, often in a mischievous or haphazard way. Some synonyms for this phrase include tampered, fiddled, tinkered, played with, meddled, messed with, and tweaked. These words all suggest a similar type of behavior, but each one may convey a slightly different connotation. For example, "tampered" might suggest that someone is trying to intentionally sabotage or alter something, while "played with" suggests a more playful or curious attitude. Regardless of which word is used, the idea is generally the same - someone is manipulating something in a potentially problematic or careless manner.