Christmas cake
A cake eaten at Christmas, typically a sponge cake with strawberries and whipped cream in Japan.
I'm looking forward to eating Christmas cake with my family.
unmarried woman over 25
Jocular, dated metaphor likening an unmarried woman over 25 to a Christmas cake that is no longer fresh after the 25th. Now considered offensive and rarely used.
The term 'Christmas cake' is now considered discriminatory.