To wipe out or eat shit from taking a fall when doing something awesome.
Tom: Did you see that guy boof it?
Chris: Yes, it is my favorite word indeed, boof. I just love saying it so much. Boof. But yeah Tom, that guy boofed so hard after he hit that jump. I hope he is ok. Maybe he should think before he sends it.
Tom: but he was shredding the gnar.
Chris: that he was