Wiktionary
where it counts
adv. 1 in the most advantageous area or sphere 2 in an effective manner 3 (context euphemistic English) in the testicles
Usage examples of "where it counts".
Bush may have lost at the ballot box but he won where it counts, at the piggy bank.
In reality, it is better to bring experience and competence to love or marriage, so that the relationship can be most positive where it counts most, without fumbling or accident or misunderstanding.
Rufo--Well, Rufo has his foibles but he is utterly dependable where it counts.