Replying to Hand Drags

so my brother (who is one of "those guys" who thinks he knows everything) said snowboarders have been doing hand drag 3s and 5s off knuckles and cliffs far before skiers ever did them. he said that's where the term "knuckle draggers" came from, but I always thought that came from the fact that they occasionally put their hands down when they turn. not only have I never seen a snowboarder do any sort of hand drag trick off a knuckle or something, but I looked on youtube and couldn't find a single video of a snowboarder doing one.

can anyone tell me who has actually been doing hand drags first? I really think skiers did them first, but I may be wrong