"MonkeyRat" is slang for Opossum. To those who have never gotten up close and personal with an opossum, this slang term may seem silly. However, as more and more South American spieces are available through pet stores, more and more people are familiar with the monkey-like hands and feet, and the prehensile (grabbing) tail of Opossums.
I have a pet monkeyrat, and she is the snuggliest of all my pets. And she climbs like crazy!
A ratmonkey is someone whom possesses the qualities of both the rat and the monkey. This word was derived from ancient RTK tablets, carved by the Rat gods and the Monkey lords. It was once a word of great pride, but now it is one of great shame due to societal changes. It is even considered a slur in some cultures.
"Pleaseburn yourself alive you Ratmonkey."
"This ratmonkey keeps on spamming me."
"GODDAMN IT YOU FAT RATMONKEY I WILL KILL YOU"