When a man hurts himself then screams like a big sissy girl with little pigtails in pain or simply complains too much and a friend states this phrase which will make them make them feel stupid, humiliated and unmanlike/unmanly/increasingly more womenly it can also be used to belittle men who display womeness.
(man chips nail then crys)
"Man It Out Clint"
(Meat-Head guy swallows live Grenade)
(Nearby man screams with fear and runs off)
(Meat-Head guy bellows "Man It Out" You fool as he is exploding)