It's a derivative of "throwing someone under the bus". But, it's harsher, deeper, and more direct.
You can accidentally throw someone under the bus. But, bus fucking someone is on purpose.
Bill: Dude, you threw Bob under the bus in the sales meeting today because we didn't hit goal.
Ted: I didn't throw him under the bus. I hate that asshole. I bus fucked him, right to the bosses face!
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