PRAT
buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass
(noun) the fleshy part of the human body that you sit on; “he deserves a good kick in the butt”; “are you going to sit on your fanny and do nothing?”
Source: WordNet® 3.1
Etymology 1
Noun
prat (plural prats)
(now Scotland) A cunning or mischievous trick; a prank, a joke. [from 10th c.]
Adjective
prat (comparative more prat, superlative most prat)
(obsolete) Cunning, astute. [13th-17th c.]
Etymology 2
Origin unknown. Perhaps a specialised note of Etymology 1 (see above).
Noun
prat (plural prats)
(slang) A buttock, or the buttocks; a person's bottom. [from 16th c.]
(UK, slang) A fool. [from 20th c.]
(slang) The female genitals.
Synonyms
• See also fool
• See also buttocks
Anagrams
• TRAP, part, part., patr-, rapt, rtPA, tarp, trap
Source: Wiktionary