I've always wondered what the name for this was! When I was younger I noticed a common one in some of my social groups, "small little"; I'd always wondered whet

I've always wondered what the name for this was! When I was younger I noticed a common one in some of my social groups, "small little"; I'd always wondered whether it was a cultural phenomena (someone said it, then it kept spreading) or a more natural diminutive (like I think "small nitpick" is).