(informal) A smart aleck or know-it-all.

(US) A person wearing fancy clothing; a member of a social elite. / A person very concerned with their appearance.

Alternative spelling of fancy pants / Someone fancy, silly or attractive.

overly fancy with little function; newfangled; complicated

(chiefly US, idiomatic) Done by feel, guess, or trial and error rather than by careful planning, thought or technique.

(now rare) Someone (especially a woman) with a high sexual appetite.

Very brief, tight shorts mainly worn by women and girls.

(Australia, Canada, New Zealand, US) Sweatpants.

Casual pants or trousers, usually for women, with the bottom hem reaching to below the knee but above the ankle; usually lightweight and summery.

An effeminate man; sissy, wimp.