lol @ this thread. Define a big dhabo on men. Do you mean like one that is mostly fat? If so then yeah that's pretty weird.
But the glutious maximus is the largest and most powerful muscle in the entire human body. Anyone here that lifts and does squats knows what I'm talking about. Having strong butt muscles is a desirable atheltic attribute. It equates to generating more force and power. Perhaps that's why Somalis dominate long distance running, besides us being loaded with slow twitch muscles.