Is turning hands upside down when telling bad things in du'a that we don't want to happen is bid'at or it is sunnah?
For example in du'a Salâten Tuncina when they say "afat" which means disaster...
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There's no Sahih hadith telling us that the Prophet turned his hands upside down when he told bad things.
Some have actually claimed the Prophet did this when asking for rain, but there's no evidence to confirm it.
So to do it isn't the sunnah and would be considered bid'ah as it doesn't agree with the method of Rasulullah on how to make du'a.
“When the Prophet (pbuh) asked something to happen from Allah, he would make his palms face the sky. However, when he wanted to avoid something, he would make his palms face the ground.” (For the hadiths regarding the issue, see Musnad, Ahmad b. Hanbal IV/56; Majmauz-Zawaid, X/168; Jam’ul-Fawaid, II/618; al-Fathul-Kabir, II/357)
“Prophet Muhammad (PBUH) was turning his palm up by the time he was asking Allah anything to be done. However, He was turning his palm down when he wanted to avoid something.” (For Hadiths regarding the issue, see: Musnad, Ahmad b. Hanbal 4/56; Majmau’z- zawaid, 10/168; Jamu’l-fawaid, 2/618; al-Fathu’l-kabir, 2/357; )