Halloween Morning Riddle

I’m how crowds greet the president as he mopes sadly;
A term of endearment when loving them madly;
The toddler in Monsters, Inc.; Mockingbird’s Radley;
And ghosts’ startling call-out to frighten you badly.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

3 Responses to “Halloween Morning Riddle”

  1. Neel Mehta Says:

    “Lock him up”?

    Sorry, I’m a person on the Internet and incapable of reading past the first line before commenting.

  2. Asher Says:

    BOO

  3. Bill Says:

    BOO is correct. Way to go, Asher!

    I was tempted to accept Neel’s answer, as “Lock Him Up” Radley could totally be a thing, but I already did “Lock” in a previous riddle.

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