Cake whore is a term used, usually not in an offensive way, to describe someone who eats all the cake.
The "cake whore" can be either male of female, but tends to be female, hence "whore".
Cake can be used as a collective term for other foods e.g. crisps, chocolate...
1. "Hey Jenny, stop being such a cake whore :]"
2. "Holy sh*t, Sue is a cake whore!"