Plural of baller; people who play ball sports skillfully, or slang for successful, wealthy people or athletes.
From 'ball' + the agent suffix '-er' (one who does something), with '-s' for plural. The slang sense meaning 'successful person' gained prominence in hip-hop culture in the late 20th century.
The word 'baller' transformed from simply 'someone who plays ball' into a badge of success and swagger—language evolves fastest in music subcultures, where new meanings can spread globally in months!
Complete word intelligence in one call. Free tier — 50 lookups/day.