ho·cus-po·cus 
(hō′kəs-pōkəs)
(hō′kəs-pōkəs)n.
1. Nonsense words or phrases used as a formula by quack conjurers.
2. A trick performed by a magician or juggler; sleight-of-hand.
3. Foolishness or empty pretense used especially to disguise deception or chicanery.
tr.v. ho·cus-po·cused, ho·cus-po·cus·ing, ho·cus-po·cus·es or ho·cus-po·cussed or ho·cus-po·cus·sing or ho·cus-po·cus·ses
To play tricks on; deceive.
[Possibly from an alteration of Latin hoc est corpus (meum), this is (my) body (words used in the Eucharist at the time of transubstantiation).]