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What is cinder block sit down?
A sexual act were a funnel is lodged into one partner's sphincter while laying face down making a 45 degree angle with their body. The other partner then proceeds to poor cement into the lodged funnel. This causes a chemical reaction with the rectum and begins to solidify the cement into hardened concrete. After undergoing surgery a perfect mold of the human rectum as a result.
Poor Sam couldn't handle the cinder block sit down, but now I have this nifty paper weight.
cinder block sit down - video
