Why is the ninth month called September?
expensive, esp. showy or vulgar jewelry or clothing
The rapper wore his bling-bling jewelry to the party.
from hip-hop vocabulary; imitative of the light reflected off such jewelry
also bling-bling, by 1997, U.S. rap slang, "wealth, expensive accessories," a sound suggestive of the glitter of jewels and precious metals (cf. German blinken "to gleam, sparkle").
Jewelry, often gaudy or ostentatious: keep trying to find some bling-bling for my right hand
[1990s+; fr the sound it makes]