roflcopter

The story

1. Proto-Indo-European*Hreth₂-
2. Proto-Indo-European*Hróth₂eh₂
3. Proto-Italic*rotā
4. Latinrota
5. Latinrotula
6. Latinrotulāre
7. Old Frenchroeler
8. Middle Englishrollen
9. Englishroll
10. Englishrolling
11. Proto-Indo-European*h₂en-
12. Proto-Germanic*an
13. Proto-West Germanic*ana
14. Old Englishon
15. Middle Englishon
16. Englishon
17. Proto-Indo-European*pleth₂-?
18. Proto-Indo-European*pel-?
19. Proto-Indo-European*pleh₂-
20. Proto-Indo-European*pleh₂ros
21. Proto-Germanic*flōraz
22. Proto-Germanic*flōruz
23. Proto-West Germanic*flōr
24. Old Englishflōr
25. Middle Englishflor
26. Englishfloor
27. Proto-Indo-European*klek-
28. Proto-Germanic*hlahjaną
29. Proto-West Germanic*hlahhjan
30. Old Englishhliehhan
31. Old Englishhlæhhan
32. Middle Englishlaughen
33. Middle Englishlaughynge
34. Englishlaughing
35. Englishrofl
36. Proto-Indo-European*welH-
37. Ancient Greekἕλιξ (hélix)
38. Proto-Indo-European*peth₂-
39. Proto-Indo-European*péth₂r̥
40. Proto-Hellenic*pterón
41. Ancient Greekπτερόν (pterón)
42. Frenchhélicoptère
43. Englishhelicopterclip.
44. English todayroflcopter

From rofl + -copter. Though popularized by the image at roflcopter.com (a website, now defunct) in 2004, the term appears to have enjoyed some use in 2003 and before, though seldom.