tail end

nouns

the time of the last part of something
"the fag end of this crisis-ridden century"; "the tail of the storm"
fag end, tail, tail end
any projection that resembles the tail of an animal
tail, tail end
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?"
arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush