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To brush hair to the back of the head and cause it to lie flat with water, oil, gel, or some other product. A noun or pronoun can be used between "slick" and "back." I wanted to slick my hair back for our school photos, but Mom wouldn't let me. Try slicking it back first, then style it from there.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To cause something, especially hair, to lie flat by making it moist or oily and brushing it back: He wet his hands and slicked back his hair. She slicks her curls back with gel.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.