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the greatest thing ever (Philly slang).
You might here the following in Philly:
"The Phillies are the bomb diggity."
"This cheese steak is the bomb diggity."
"The Liberty Bell is the bomb diggity, if you're into that kind of shit."
"Dude your mom was the bomb diggity in bed last night."
by Nick D September 09, 2003
Someone who is incredibly awesome for unexplained reasons.
"What do you think of that new girl Gretchen?"
"She's the bomb diggity."
by UFO TOFU February 25, 2009