Is a reference to a spoilt desert dish, normally used as a gag at frat parties. The general act of cake is when one defecates into some unfortunate unsuspecting individuals gateau, laughs mischievously, replaces the top of the gateau and leaves the room.
Said victim, proceeds to scoff the pudding suspecting that gandma has forgotten the appropriate place to empty her colostomy bag.
Said victim - 'Nan, if you keep shitting in my gateau, it's going to a real...'
Nan - 'If you criticize my baking skills again I will shit into your wellington boots, I have never baked a Cake in my life!'
Said victim - 'What is a Cake?'
Nan - 'I don't know look it up on urban dictionary'
Said victim - 'They would never have the balls to put that up'
Nan - 'This is becoming a bit repetitive now, they're just doing their job'