a huge amount of backspin put on a table tennis or tennis ball that causes that particular ball to drop over the net and spin away from the opponent, see boofoo
Wow, that ball had a lot of quadheedus on it. or I gonnaput the quadheedus on this shot!
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