nalolbittif - You're not laughing, but you're trying to make it look like

You're not laughing, but you're trying to make it look like you are. It’s like you’re a fake laugh robot.

'I did a nalolbittif during my boss's rant about coffee.'

'He did a nalolbittif at my dad's joke about his bald head.'

'She did a nalolbittif when I said 'I’m not going to the party.'