Of coarse you do and so do I. Should the spelling be coarse or course in this situation?

Answer:
Of course you do is the correct usage. Coarse means something that is rough like sandpaper, or someone who is uncouth, with poor manners.
First answer by Rosenthal1. Last edit by Rosenthal1. Contributor trust: 30 [recommend contributor recommended]. Question popularity: 1 [recommend question].