quote[the term jolly roger likely stems from the fact that pirates enjoyed taking part in rape, and a “roger” in old english was sometimes meant as “fucker” so “jolly roger” was a “happy fucker”]quote

Don't make stuff up. "Jolly Roger" comes from the French "joli rouge" (meaning "pretty red"), a reference to the red flags. It could also just be a reference to the grinning skull, or, as the article says, a corruption of the name of the pirate Ali Raja.