Put this clip last in a reaction chain, after the setup line and before you cut away. Pair it with an oh my god wow reaction for a bigger response, then follow with a no no wait wait moment when the speaker tries to take it all back.
About this sound
This is a 19-second voice clip centred on the loose, throwaway phrase just you know, delivered like an offhand aside rather than a big line. It gives a listener a funny, slightly awkward shrug feeling, the sound of someone trailing off, playing it cool and leaving a statement deliberately unfinished and unbothered.