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When you're engaged in sexual intercourse, typically in the doggystyle position, and you fuck so hard that your hip bones are hitting her assbones to the point of physical pain.
"shit dude i was hittin the bump stops in that $1.20, it was a mercy root i swear"

"Man I was smackin the guts out of the missus last night, goin so hard i hit the bump stops"
by foswizz August 15, 2008
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Bump Stop

β€” n
1. A method of driving lowered cars over speed bumps

β€” vb
2. ( tr ) To stop a car before carefully maneuvering (usually at an angle) over a speed bump
That rides bump stopped HARD!!!

So bump stopped it scraped cats eyes!
by EvlEvo June 15, 2012
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