A seven-letter word: torture. It's usually forced by parents in order to have their kids get the vitamin A they need for them to grow. It instead tastes like urine when the liquid form is taken.
I was forced to take cod liver oil for a few years, and it was absolute torture. Thankfully I do not need to do this anymore.
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