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1. To exit slowly and often stealthily. The cat crept out from under the bush to see if the dog was gone.
2. slang To make someone feel uneasy. In this usage, a noun or pronoun is commonly used between "creep" and "out." I'm OK with most bugs, but centipedes just creep me out, man. That guy in the corner was really creeping us out, so we decided to leave.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
creep out (of something)
to go out of something or a place slowly and carefully; to sneak out of something or a place. A little mouse crept out of the cupboard. The fox crept out of the henhouse, carrying a chicken.
(from under someone or something) Go to out (from under someone or something).
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.