1 - When you rammin her and you "accidentally slip(fukkin liar)" and hit her in the sphincter with ya kong dong more then once.
2 - When you think all of a skanerdoodles slut holes are attractive and you want to cock slam as many as you can.
My hoe bag won't let me cock smash her backside dark vortex, so I keep playing bumper holes to try and push the issues.
That 500lb fat crusty cum dumpster got so many sweaty folds I am gonna play Bumper holes with as many as I can.