According to Stephen King in Dreamcatcher, fuckaroo means an extremely fucked up situtation, as opposed to fuckaree which means having a great time, usually but not necessarily, sexual.
Fuckaroo is the sex act when someone gets on their hands and knees naked while another person gets on them naked and the person on bottom bucks as hard as they can to knock the other off and if they fall the one at bottom gets to have his or hers way with them
A situation in which promises are made and later broken, often knowlingly and wilfully. Like the donkey that has the carrot dangling in front of him, but the owner knows all along that he will never let the donkeyget that carrot.
When I started working here thirty years ago, they promised me a golden pension with full benefits when I retired. Now that it's time for me to retire, they're cutting the benefits for retirees. They pulled a fuckaroo on me. There was a fuckaroo waiting for me at the end of the line.