Joy

A gender-neutral term to use instead of "boy," and "girl." It has one syllable, so it's simpler to say in some circumstances instead of "person," or "child," etcetera.

They're the smartest joy here.

Summer camp,

A codeword for a long-term psych ward or residential behavioral health facility. Typically used when in public or when speaking with people who don't know you were in a mental facility.

"Oh, sorry for replying so late, I was at a 'summer camp,'"