When you talk too much, about too much, that may may or may not be related to the conversation in progress. It must offensive, always. It is the thin line between tasteless, and genius. However, one of the strongest points of pulling a "Coatsy" will be to use elaborate free association to legitimize the already disenfranchised diatribe in order to justify the relentless word storm.
this is a "coatsy" in progress.
"shut the fuck up coatsy!"