What is the meaning of ass?

noun

• 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, tail end, tooshie, tush, bottom, behind, derriere, fanny
• A pompous fool.
• Hardy and sure-footed animal smaller and with longer ears than the horse.
• Slang for sexual intercourse.
  • synonyms: fuck, fucking, screw, screwing, nooky, nookie, piece of ass, piece of tail, roll in the hay, shag, shtup