It is nothing (i. e. it is a mere superstition). They said: Allah's Messenger, they at times narrate to us things which we find true. Thereupon Allah's Messenger (ﷺ) said: That is a word pertaining to truth which a jinn snatches away and then cackles into the ear of his friend as the hen does. And then they mix in it more than one hundred lies.
Sahih Muslim Book 39, Hadith 169