[Willwhatley]

NIH doesn't seem to make sense as "next of hop" or "not in here", and search for this initialism is obfuscated by the National Institute of Health.

Mind expanding NIH?

[phab]

Not Invented Here (https://en.wikipedia.org/wiki/Not_invented_here)

[h1d]

Better to avoid vague grammars when not everyone is a native English speaker.

[nailer]

Pretty discoverable/common: https://www.urbandictionary.com/define.php?term=NIH