the.com/kiddo

The word you use when you forgot their name but not your affection.

means An informal, affectionate way to address a child or younger person — or anyone you want to speak to warmly and casually.

from Simply 'kid' plus the informal '-o' suffix (the same ending you see in 'cheapo' or 'weirdo'), which English likes to slap onto words to make them feel breezy and familiar. 'Kid' itself originally meant a young goat, and only slid over to mean 'child' in casual slang before kiddo tagged along as its friendlier, pat-on-the-head cousin.

origin
kid plus -o, American slang, early 1900s
power move
used by bosses, coaches, and smug old men equally
tone range
works as both endearment and veiled condescension
never ages
applies to toddlers and forty year olds alike
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