skate term for when a skater attempts to ride the board down a long/steep hill. The hill is usually loaded with cracks, holes and pebbles to make it more difficult for the skater to reach the bottom without falling. Can be amazing if done successfully, horrific if failed
Example 1:
Friend: Whoa this hill is steep AF
Skater: Yeah, this is gnar. I'm gonna hill bomb it
Example 2 (Vine):
Off camera guy: What's your name?
Kid: Marty McFly Williams
Off camera guy: And what are you about to do?
Kid: I'm about to bomb this master hill
(proceeds to eat shit)