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Butt Monkeys!

Monkey that lives in somebody's butt, or a very pesky person who you want to feed to a rabid Mako shark.

"Stop being such a butt-monkey and help me clean this garage!"
-The Urban Dictionary.

Also in the Urban Dictionary.

butt-meat - The worst insult ever. Ev-er!

I am gonna use this term.

Then there is....

Butt-knuckle

1.)The smelly brown knuckle of the finger or thumb inserted in someones butt. 2.)The person inserting said finger or thumb 3.) The act of inserting said finger or thumb in one's butt, possibly due to boredom or lack of interest. 4.)Someone who complains alot but does nothing and/or offers no suggestions about how to remedy the problem he/she is complaining about.