They really kicked themselves in the foot

This is a mash up of “shot myself in the foot” (said or did something stupid that causes problems for the person)  and “kicked myself” (feel angry with yourself because you have done something stupid).  This was heard by Deb Rose on a local sports show in Oklahoma.  After the University of Oklahoma suffered a painful loss, making mistake after mistake and giving away the win, a local sportscaster said, “Boy, they really kicked themselves in the foot!”