look in any dictionary, try Webster's, under bullgine- not bulgine- 'bulgine pie' is nonsense, there is no such 'dish', but I think it is meant to be scatalogical, like 'cow-pie', used for the rhyme & to go with 'pumpkin pudding'. These two shanties started life as railroad work songs, not sea shanties, so the connection to bulgines is to steam locomotives, maybe 'bulgine pie' is some slang expression for detritus involved with the railroad that has been forgotten, but I'd vote for a somewhat scatalogical nonsense rhyme.