It's a pun on how some drivers might be distracted by the 'beautiful bottoms' of other cars and attempt to surprise buttsex them instead of overtaking. Bottom being an English term for one's ass.
WHAT THE HELL?!?!
I guess there weren't any flaws in the video, cause I didn't see any, because I am not even going to pretend I actually watched the video, the song itself stole the show and ran away with it shouting "chase me! chase me!"
Laughed so hard