It's a fantasy role-playing game.

DM: You are Grog Strongjaw, a goliath barbarian . You are the member of the famous group of adventurers. Previously,  The party completed the venture of taking the Horn of Orcus to a place of safety and sealing it away, hopefully for eternity, with the help of Lady Kima and two of the Scalebearers. After heading to the basement of the Platinum Sanctuary in the city of Vasselheim, they succeeded in doing so.
DM: There you go. All righty, cool. So you hit him across the face and you hit him to the other side. He comes back, aligns his chin, and you can see he's now stooping in for some sort of an uppercut as he slips to the side a little bit with a sidestep. That will be a 25. A 20. And a one. So what's your AC?
Player: 20.
DM: All right, so both the first two hit. As he comes low for a full-on uppercut, hitting you for, that would be six points of damage (whack) under the chin. As you're currently reeling from the impact, he crouches down and is going to go for a knee to the middle of your groin. That is another six points of damage (whack) right in the Phillip junk. You instinctively give out a (grunts) from the impact. After that point, he comes up and it looks like he tries to go for some sort of a pile-drive grapple, and you instinctively kick off of him and his third attack is completely wasted. It's now your go.
Player: No one fucks with Phillip Jr. I would like to bull rush and try and tackle him, and if it succeeds, I'd like to headbutt him on the ground.
DM: Okay, okay. It's an action to do that, so you can use your bonus action to attempt--
Player: And I would only get two attacks, right?
DM: You only get one with this, technically. It's an action to grapple.
