A derogatory phrase used to berate or otherwise castigate another male as to make him feel inferior to other males or to put him in his place. This phrase almost always alludes to the other male as belonging to a different sexual orientation (ie homosexual). This phrase is usually uttered in a heated conversation.
Listen you F**king Cum Stain. Why don't you go suck another couple hundred cocks before you try to run off at the mouth to me. Do you know who I am?