Green’s Dictionary of Slang

bomb adj.1

also bomb-ass
[bomb n. (11)]

[1970s+] very good, excellent, the best.

In compounds

’bomb-baida (n.) [ety. unknown]

[2000s] (US black) extremely potent marijuana.

bomb-diggity (adj.) (also bomb-biggity, bombdigadee, bomb-diggidy) [var. on hot diggety (dog)! excl.]

[1990s+] (US black) a general term of approval.