Inching off
To inch off means to be so eager to go and do something you're uneasy in your seat and slowly getting up.
Yola was so eager to go dancing that she was inching off her seat at The Lemon Bar.
an inch off the wall
When a notoriously hot chick is in the twilight of her hotness and about to pass over into mediocrity.
Pam Anderson was the ultimate hot snatch, but I saw her recently and she’s an inch off the wall.