Definition from Wiktionary, the free dictionary
fancypants pl (plural only)
- (pejorative) Alternative spelling of The condition of being overly showy; concerned more about one's reputation than anything else.
2001, William W Johnstone, Code of the Mountain Man, page 29:
- And I don't need some fancypants US Marshal from back East stumbling around screwing up what trail there is left. You understand me?