Gay oriented poetry or song lyrics. Also, when people start insulting each other by inviting adversaries of the same sex to perform sexual acts on them.
John says: "Hey Billy why don't you suck on my genitilia!" and continues insulting Billy by inviting him to perfom various sexual acts.
Billy responds: "You just go right ahead and keep serenading me with your homoetry"
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