It is nothing (i. e. it is a mere superstition). They said: Messenger of Allah, they at times narrate to us things which we find true. Thereupon Messenger of Allah 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. (Using translation from Muslim 2228b)
عَائِشَةُ زَوْجُ النَّبِيِّ ﷺ سَأَلَ أُنَاسٌ رَسُولَ اللهِ ﷺ عَنِ الْكُهَّانِ فَقَالَ لَهُمْ رَسُولُ اللهِ ﷺ لَيْسُوا بِشَيْءٍ فَقَالُوا يَا رَسُولَ اللهِ إِنَّهُمْ يُحَدِّثُونَ أَحْيَانًا بِالشَّيْءِ يَكُونُ حَقًّا فَقَالَ رَسُولُ اللهِ ﷺ تِلْكَ الْكَلِمَةُ مِنَ الْحَقِّ يَخْطَفُهَا الْجِنِّيُّ فَيُقِرُّهَا فِي أُذُنِ وَلِيِّهِ قَرَّ الدَّجَاجَةِ فَيَخْلِطُونَ فِيهَا أَكْثَرَ مِنْ مِائَةِكَذْبَةٍ