nose. This is when you aren’t laughing out loud due to tiredness, sickness, not liking the person, or just because the joke wasn’t that funny and all you could do was change the pattern of your nose breathing.
The genius of it is that absolutely no one will know what it is unless you tell them. If they ever ask, just respond with a cool “idk” or “nvm” to divert from a colossal mess.
Karen: Cindy! How do you catch a squirrel?
Cindy: I don’t know Karen.
Karen: GO UP IN A TREE AND ACT LIKE A NUT!