That's why none of these dum-dums could
“Dum-dums” can be taken 3 ways.
Jay is way too smart for the ‘dumb’ people who want to kill him.
“Dum dums” is slang for hollow point bullets. In this sense Jay would be implying that since he’s already ‘been there and done that’, you can’t get him, possibly due to his criminal connections. Essentially saying he’s bulletproof.
Also could refer to The Great Gazoo from the Flintsones. He refers to Fred and Barney as “dum-dums” and constantly causes problems for them. He can materialize and dematerialize objects, teleport, and travel through time.
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