(noun) a fake purpose designed to remove an undesirable individual from your presence; can be disguised as a favor, a request for an item, a directive, an errand, a request to verify information, etc.; old and effective device used in office politics
Pepe: Hey Dave, where's Mac?
Dave: (snickers) I gave him a furpose
Pepe: Oh, he's out at the hardware store getting duct tape again?
Dave: You got it, Pepe!
Pepe: Can I send him out for WD-40 next time?
Dave: Why suuuuuuuuuuuuure!