I love this. It's adorable and strangely somehow always in keeping with the DC cannon as far as personalities go. I just wanna pick up little Bruce and hug him...and not just because his rxn would be HILARIOUS.
Smorgasbord is an english version of the swedish word "smörgåsbord." Smörgåser is actually a danish dish, which is pretty much a metric shit-ton of open whole grain sandwiches with more or less ANY kind of filling.
The word is used in english as an expression of "There is so much [something] here, I'll never run out!"
So what Batsy here is saying, is "There is so much EPIC BROODING POTENTIAL here, I'll never run out!"