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vulgar slang To masturbate. A term only applied to men. A: "Why is he all embarrassed today?" B: "Oh, his crush walked in on him fapping it. How horrifying is that?"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To masturbate. Used of a male.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.