A racial slur often targeted at members of the betailed Saiyan race. Saiyans find this offensive because it suggests their uncivilized nature, which non saiyans are expected to ignore. It should also be noted that, Saiyans do customarily refer to each other as Monkey, which when used in such a context, is a term of endearment.
"I can't believe I was defeated by a MONKEY!"
"Hey man, you hear that Monkey Kakarot just pwned Frieza?"
Monkeys are haplorhine ("dry-nosed") primates, a paraphyletic group generally possessing tails and consisting of approximately 260 known living species. Many monkey species are tree-dwelling (arboreal), although there are species that live primarily on the ground, such as baboons. Most species are also active during the day (diurnal). Monkeys are generally considered to be intelligent, particularly Old World monkeys.