Swing both ways informal verb phrase
To have sexual feelings for both men and women.
I must confess something to you. I found out that I swing both ways since college.
Had I known you swing both ways, you'd have been mine already.
The verb "swing" should be conjugated according to its tense.
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?