A special beer which is drunk in between the normal beer of choice as a treat or nice change from the cheap session beer. When the person does not have much money but uses the pudding beer as something to look forward to.
E.g. Drinking a few pints of stella followed by a banana bread beer.
Phil: Nice pint Jack, is that your pudding beer?
Jack: Yeah hammered my way through some stella to earn myself this baby.
Phil: Well done mate u bit tipsy then?
Jack: Yeah hammered my way to numb weller and kill babies
Phil: Oh dear Jack.