A form of obnoxious reproach, offered by a non-authority and normally in the form of an insistence that others adhere to rules. This decree is normally made when the rule being broken is only offensive to the one issuing the lardunn and is not significantly interfering with others' enjoyment.
Person B: Dude, whatever. Stop with the lardunn already.
Person A: Your mp3 is in an unacceptable format as you chose to use a low constant bit rate when a higher VBR was available. And have you ever heard of lossless, retard?
Person B: Do you have a girlfriend? Nice lardunn, a-hole.
Source: Erik Estrada, Los Angeles, CA