Big back meaning can be slang indicating riches, position, or "backing" from influential people in some groups or musical subcultures. It could suggest that someone has institutional or financial backing. With the popularity of poetic metaphors in hip-hop and rap, its usage has increased despite being less frequent. The "back" represents a power or foundation holding someone up. This development demonstrates how words associated with physical characteristics can be imaginatively changed to represent power in the realm of finance or social standing.