Is this coreect to say, in proper english :
"I didnt have a shred or smack idea, about this coming ".
No. Say eg I didn't have a shred of an idea about this coming. eg I didn't expect this in the least.
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No.
Say
eg I didn't have a shred of an idea about this coming.
eg I didn't expect this in the least.
'smack' is wrong.