What is the meaning of tail end?

noun

• The time of the last part of something.
  • usage: "the fag end of this crisis-ridden century"; "the tail of the storm"
  • synonyms: fag end, tail
• Any projection that resembles the tail of an animal.
  • synonyms: tail
• The fleshy part of the human body that you sit on.
  • usage: "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing"
  • synonyms: buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tooshie, tush, bottom, behind, derriere, fanny, ass