The definition of a fussbudget is an overly fussy or picky person.
A person who has to have everything done in a specific way and who is overly picky is an example of a fussbudget.
Informal a fussy person
also Chiefly Brit., Informalfuss′pot·
Origin of fussbudgetfuss + budget, probably in sense “bag, sack”
A person who fusses over trifles. Also called fusspot.