A douchebag with an added flair for claiming everything as his own.
The DibsBag is usually a spoiled
brat who accomplishes almost nothing on their own, takes credit for other peoples work, and brags about how good he is doing.
IE; John builds a successful company through long hours and years hard work, then
Jason (the DibsBag son of John’s business partner) brags to anyone about how successful his company is, even though
Jason has never worked for the company a day in his life.