the art of cock blocking. When a person would rather not introduce their male friends to a group of single girls. A person who does not want to "help a brother out" when their friend is trying to win over a female.
A person who, on purpose reduces the chance of their peer getting a girl by making him look bad/silly/dumb.
Did you see what my brother did to me last night, Rubbabent!
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