Simple past tense and past participle of monkey.(verb)
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Use "monkeyed" in a sentence
"The standard watch is at the wagon, and must not be "monkeyed" with, a trick sometimes played on tenderfeet."
"In a telephone interview, Ebell questioned NASA's climate data for the 1930s, which he said had been "monkeyed with" by scientists aiming to show anthropogenic climate warming."
"Large numbers of coins have been conserved, dipped, processed and generally monkeyed around with in the past few years."