lick one's chops
lick (one's) chops
1. To anticipate eating (something) with great eagerness or appetite. I was licking my chops when the waiter set the juicy steak down in front of me.
2. To show one's impatience or excitement to do something. You should have seen John at the car show. He was licking his chops looking at all those fancy sports cars. My detractors were practically licking their chops when they heard that my proposal had failed.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
lick one's chops
Also, lick one's lips. Anticipate with great pleasure. For example, The kids were licking their chops as Mother described the family vacation plans, or I couldn't help but lick my lips when she talked about the menu. Both expressions allude to anticipating a tasty morsel of food. The second is the older, dating from about 1500 and used interchangeably with lick one's fingers, now seldom heard. The first also served as 1930s jazz slang for warming up, chops meaning "the jaw or mouth" (a usage dating from the 1300s).
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
lick one's chops, to
To anticipate something with obvious pleasure. The word chops (or chaps) has meant the jaws or mouth since about 1350, usually referring to the lower jaw of animals. This meaning survives in the current cliché, as well as in musicians’ slang for the embouchure of wind instruments. In jazz slang of the 1930s and 1940s, licking one’s chops meant warming up before a performance. In jazz parlance chops also came to mean ability or skill, a usage from the 1960s.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer