- in the most advantageous area or sphere
- True, Madeline does not have a lot of book smarts, but she is plenty wise enough where it counts.
- in an effective manner
- At first the boycott's impact was barely noticeable, but now the protesters are hurting the store where it counts.
- (euphemistic) in the testicles
- A girl's best weapon--and one that should be used sparingly--is a swift kick where it counts.