This is any type of lollygagging, undesired horseplay, or any type of "gay" behavior.
Gay in the same sense as other slang meanings, not necessarily homosexual.
Any type of intentionally procrastinative activity.
Akin to "Grabass"
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