1. a fussy or needlessly fault-finding person
"Mariah Carey is rumored to be a big fussbudget."
"You have overspent your fuss budget for the day, you fussbudget!"
Origin: (from etymonline.com)
"1904, from fuss (n.) + budget (n.). One of several similar formulations around this time: Cf. fussbox (1901); fusspot (1921)."