shoot (one's) cookies
slang To vomit, especially violently or profusely. With the way that boat was rocking back and forth, I felt like I was going to shoot my cookies over the side at any minute. My roommate came back from his birthday celebrations and promptly started shooting his cookies into the trash can.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
shoot one's cookiesand shoot one's breakfast; shoot one's supper
Sl. to empty one's stomach; to vomit. I think I'm gonna shoot my cookies. I shot my supper, and I was glad to get rid of it.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.