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A dusty bumper is the action of falling ass-first into the dirt while ones pants are around their ankles. Common during rowdy outdoor sex and defecating in the woods. If the latter is the cause of the dusty bumper, one may walk away with a rusty bumper.
Earl: Last night, I was beatin' cheeks with Becky in them woods right behind my trailer, when i tripped over a stob and gave myself a dusty bumper!

Jim-Bob: Well hell yeah brother, than poon is totally worth it! Fuckin' ain't nuthin' if she ain't yer cousin! Yeeeehaw!!
by Hammer of Jesus August 04, 2017
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