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Fadid is when you and your friend decide to do something stupid right then and there without even thinking about it.
I was eating a sandwich and my friend said 'let's fadid' and we ran into the street and yelled at a pigeon.
We were in math class and fadid'd and tried to throw erasers at the teacher.
I was on the toilet and my friend texted me 'let's fadid' and we went outside and tried to balance on a fence.