Fa-giggly Gland
the thing that makes a person laugh until they're out of breath and questioning their life choices.
She saw a guy eating a whole pizza and started laughing. Now she's on the floor and won't stop.
I texted my brother a meme and he laughed so hard he fell off the couch. His fa-giggly gland was wild.
During the movie, the kid behind me kept making weird noises. Now I'm the one laughing like a madman.