This lecture talks about how we, as humans, use language to communicate, or miscommunicate, our intentions. Pinker provides some insight as to what is meant by it. For example, speakers use the veiled overtures to communicate on the safest level possible while relying upon the listener to read between the lines and progress the relationship if so desired. In this way, the speaker can signal interest in deepening the relationship without actually moving to the next level (which could destroy the relationship if the listener does not reciprocate). (This corresponds with Daniel's Levels of Relationships theory as a way to prevent the relationship level violations).
Steven Pinker - The Stuff of Thought: Language as a window into human nature (RSA)
RSA Animate - Language as a Window into Human Nature