prat(noun, adjective) adjective1. (obsolete) Cunning, astute. [13th-17th c.] noun1. the fleshy part of the human body that you sit onSimilar word(s): backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hindquarters, keister, nates, posterior, rear, rump, seat, stern, tail, tushDefinition categories: body