dust (one's) pants
slang To spank (strike on the buttocks) one, typically a child, as punishment. No, I need to go home now because my dad said that he'll dust my pants if I disobey him again.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dust someone's pants
Sl. to spank someone, usually a child. My dad will dust my pants if he hears about this. I'm too old for somebody to dust my pants.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.