4. badonkadonk
5. behind

6. biscuit

7. bonbons
8. booty
9. bottom
10. breech

11. bum

12. bumper
13. buns
14. caboose
15. can
16. cheeks
17. cushions

18. derriere
19. duff
20. fanny
21. fourth point of contact

22. fundament
23. glutes

24. groove thing

29. junk in the trunk

30. kazoo
31. keister
32. landing pad

33. moneymaker
34. moon, the
35. nether regions
36. patootie
37. pockets

38. poop chute

39. posterior
40. prat
41. rear; rear end
42. rumble seat
43. rump; rumpus
44. rusty dusty
45. seat
46. shelf

47. sit-upon

48. southern exposure
49. stern
50. tail
51. taillights
52. trailer