Go fuck yourself informal verb phrase rude slang taboo
Used to express anger, dismissal, or contempt directed at someone
Go fuck yourself! Same to you!
Go fuck yourself! I don't want to see you anymore.
How dare you speak to me like that? Go fuck yourself!
This phrase emphasize that Christmas takes place once a year time, so you should grab this chance to indulge yourself and be good to others.
I've eaten a little more than usual as today is Christmas and Christmas comes but once a year, right?