This is when you take a shit and you are super constipated and it is really hard to come out. In the end, it is just a few little pebble sized nuggets. Hence, "Pebble Beach" it is a touch golf course and it is named after pebble's.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi