So I have no clue about the relationship between diamond cutters and squats, but I have felt pretty damn stimulated after a crushing workout, usually associated with the smokin hot trainer who does fitness modeling.
Another potential cause that may be something to consider (if you have had or have any symptoms like sciatica, or numness in buttocks, or pain running down legs or even in feet) is that a much more common than you think cause of big spontaneous boners, is nerve damage or inflamation in or around the spinal cord. Most likely not what it is, but if you have any thoughts or symptoms it would be a good idea to get it checked out.
Usually they last a while, like you took viagra, so if they dont most likely unrelated.
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