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.
When you and your friends are playing CS:GO, and you already died in wingman so its left up to your friend, and he clutches the game with 1hp left, and Bruh Moment doesn't describe your excitement enough so you use Bruh Momento because you're a beaner
Friend: *One taps both of the enemies with a deagle across the map*