Gossip – talking about relevant others in their absence – is believed to constitute a large part of informal communication. The perception of the prevalence of gossip implies that it can be unambiguously identified and distinguished from other topics in spontaneous conversation. Its distinctiveness may be justified by multiple theoretical perspectives, including one that describes in-group gossip as an informal device for enforcing norms and punishing norm violators, and another that claims that gossip is used to release frustration and communicate envy. If the ultimate reason for gossip is to facilitate social bonding between the sender and the receiver, however, this would not differentiate gossip from other conversational topics that provide social enjoyment, such as entertainment and food. In a novel contribution, we explore the topics included in a corpus containing 550 hours of unfiltered spontaneous conversation and identify using LDA topic modeling whether some topics are unambiguously prominent in in-group gossip. The explorative approach is integrated with the manual annotation of instances of gossip across the entire corpus. We identified coherent topics of in-group gossip that are clearly different from those of small talk and storytelling. Our analysis finds that feelings, intentions, and opinions are frequently expressed in in-group gossip, more than habits, manners, and behavior. In-group gossip topics are characterized by more words associated with anger, in line with theoretical perspectives that attribute the motives of norm enhancement and punishment or frustration and envy to gossip.