Ad nauseam is a Latin term for an argument or other discussion that has continued to the point of nausea. For example, "this has been discussed ad nauseam" indicates that the topic has been discussed extensively and those involved have grown sick of it. The fallacy of dragging the conversation to an ad nauseam state in order to then assert one's position as correct due to it not having been contradicted is also called argumentum ad infinitum (to infinity) and argument from repetition.
The term is defined by the American Heritage Dictionary as "to a disgusting or ridiculous degree; to the point of nausea." Colloquially, it is sometimes used as "until nobody cares to discuss it any more."