top notch

a notch above

superior to; of a higher quality than

cherry on top

Synonym of icing on the cake (“a thing which intensifies the appreciation of something already good, or (ironic) the regretting of something already bad”).

notch on one's bedpost

A sexual conquest; a casual sexual partner.

on top

In a dominant position.

over the top

Beyond normal, expected, or reasonable limits; outrageous.

put the bottom rail on top

To reverse a hierarchy.

take down a notch

To cause a person's or group's self-esteem or importance to be decreased.

top banana

The boss, the leader.