A top ten bruh moment is not an ordinary bruh moment, but one of the top ten, as the name suggests. When one says this phrase in reaction to an incredibly sigh-worthy or devastating moment, they are implying that it is a top ten bruh moment. However, it can simply just be dropped into conversation as a response to anything, just to be annoying and cringy.
Person 1: I lost my elytra and it despawned!
Person 2: Top ten bruh moments.