fix someone's wagon

[fix someone's wagon] or [fix someone's little red wagon] {v.phr.}, {informal} 1. (Said to a child as a threat) to administer aspanking.

Stop that right away or I'll fix your (little red)wagon!

2. (Said of an adult) to thwart or frustrate another, toengineer his failure.

If he sues me for slander, I will counter-suehim for malicious prosecution. That will fix his wagon!