Originating from a bully prevention TV ad. Where the bully yells, "You suck McMiller!"

Used as an Insult.

Its been used in real life so many times as a joke, its become quite the popular saying, meaning that somone isnt very good at doing somthing.
Kid 1: *dies in a video game*
Kid 2: You suck McMiller!
Kid 1: *crys*
------
Kid 1: *trips over a rock*
Kid 2: Man, your really Sucking McMiller today
by Flame060 March 11, 2005
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