A badkamamonkey is the monkey that ensures bad karma finds its way to you when an action is performed that merits said bad karma. There is only one badkarmamonkey that watches everyone.
"I can't believe she didn't tip the waiter, badkarmamonkey is surely going to get her."
A:"I lost my iPhone yesterday."
B: "Well you did sleep with her boyfriend; I'm sure that's a badkarmamonkey play"