BRAP: [brap] verb, adjective, brappy, brapping, brapped
1)An onomatopoeia for the sound of a tires rotational momentum not being translated to forward motion on dirt. Originally the sound is of a single cylinder motorbike engine increasing in rpm, it may be used for larger vehicles or even bicycles.
"Looks like you've already been through here. I can see your brap marks."
"I brapped up the brappiest hills I've ever brapped today."