The term you give to someone with an unstable personality.
A Jaday will be someone that is annoying, self centred, loud, irrational and confusing. But at the same time, a Jaday can be kind, compassionate, intelligent, reasonable, funny and comforting.

It is this polarity in their personality which leads to the conclusion that a Jaday's personality is unstable. On the whole, once you have met a Jaday, your life is richer for the experience.

Watch out for that person, I think they are a Jaday!
by Dr Describer April 14, 2011
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Jadai an amazing guy super good at sports usually of black descent , large dick and an amazing set of abs. He’s super cute and if you find a Jadai , you need to keep him and love him for life.
Wow this guy was so perfect I thought his name was jadai
by Mr.longnose February 7, 2018
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