Niggardly, stingy.
A small fragment or sliver.
Having firm or clenched buttocks.
Rigidly maintaining self-control; restricting oneself to generally accepted rules and behaviours.
Fitting tightly in the area covering the buttocks.
Reluctant to spend money.
Excessively concerned with unimportant details; obsessively precise.
In an uptight or fastidious way.