Try using speech disorder or speech impairment to get the point across. Stutter is used too casually in society to describe all sort of things, like a TV or video 'stuttering' or fluent people saying they stutter. It's become colloquial. I usually don't say much when a fluent person tells me they stutter. Usually I just chuckle and ignore what they said, or I don't add fuel to that part of the convo. Let it fizzle out and change the topic cause I don't want to get into that. I don't expect ppl to know about stuttering or even get it if I try explaining it to them. I've realized it's just something or an experience people aren't able to wrap they're head around. Never mind the fact that in most cases I'm trying to verbally explain a communication disorder while having a communication disorder.. usually doesn't work out well.