When something just does it for you, whether it be something you like or a photo you saw that you liked, i'ts a term used to express that you accept and like whatever it may be.
"Ariana take a look at this selfie!" "a million times yes, I love this pic"
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