This paper starts by observing that an old loan word from English, the previously unstudied Finnish response particle jep ‘yep’, has recently become more frequent and gained new interactional uses. Using Conversation Analysis as a method, the paper outlines the contemporary uses of jep in messaging interaction collected in 2015–2023. It suggests that jep does not merely function as an affirmative answer, as suggested in contemporary dictionaries. Instead, it occurs in agreement and affiliation-relevant contexts, and it is used to confirm the validity of the previous speaker’s point of view and to construct it as an opinion that is shared between the participants. Although the article focuses on synchronic analyses, it also presents observations on the changes in the use of jep, paving the way for a more diachronically oriented study on the particle.