Mahakaal

Mahakaal means the destroyer of one who destroys i.e annihilator, it's Supreme Command. Like, if human acts as destroyer who destoys some other animal, then the God is Supreme Destroyer of that Destroyer. For eg. If an executioner kills someone, he is Kaal(destroyer) of that person, Mahakaal is that which acts on that executioner and that person too. Mahakaal is Supreme Hukam of God, Command of God. It's above all. People ofter confuse it with Jamdoot. Jamdoot are those, which tangle other persons in worldly pleasures but not tell them about God. Jamdoot and Mahakaal have no connection.

ਮਹਾਕਾਲ ਰਖਵਾਰ ਹਮਾਰੋ

It means the Supreme Command have blessings on person who is saying this.