Causing confusion or agitation; the present participle or adjective form describing something that flustrates.
If 'flusterate' exists, the '-ing' form would follow standard English verb patterns. This represents productive English morphology applied to an informal or dialectal base.
The progression 'fluster → flusterate → flusterating' shows how English morphology works—we can theoretically apply standard patterns to any word, though not all combinations become accepted standard usage. Your brain understands 'flusterating' immediately, even if you've never seen it before.
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