When you punch someone in the mouth, and knock out some off their teeth then you proceed to ejaculate into their mouths, so when they open their mouth it looks like a cereal bowl. You finish off the deed by saying cheerios as you walk away.
-So what happened with dude last night?
-Well I was fighting him when I finally got in a good punch and knocked him out along with a couple of his teeth, so I proceeded to to give him a cereal bowl.
-Please tell you said Cheerios as you walk away?
-It wouldn't be a cereal bowl if I didn't.