Mr. Mackey is the South Park elementary school counselor. Mr. Mackey first had sex at 19 and then not again for 21 years until he and Ms. Choksondik taught sex education together. Mr. Mackey is known for saying "Mmmkay" all the time. He also is pretty infamous for his little LSD binge he went on.
Mr. Mackey: Wh-wh-what you need to do, uh, Damien is...is to be overly nice. See, n-no matter how mean the other kids are to you, just don't retaliate. Err, be passive, mmm'kay? That's what I taught the little British boy, Pip, an-and just look at how much the other children like him now!
(scene changes to the playground, a group of kids are gathered around Pip)
Clyde: I bet I could spit the most on him! (spits on his left shoulder
Bebe: Oh, yeah? I bet I could spit in his hair! (spits in his right eye)
Pip: Oh! Nice try! A little higher and you've got it!
Right now, you're nuttier than Chinese chicken salad, mmmkay. I mean, you're one screwed up little kid, do you understand?Mr. Mackey