A notion is an opinion or belief or an idea or something along the lines of his notion is to steal when he's in a store. The context of the specified sentence was not intended to be a notion. Where it can be used that way, you would come to the wrong conclusion. We are seconding the motion (the act of banning you). The motion here is somewhat a petition to ban you. So in this case, no it is not notion.
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or just a basic youtube vid cover?