nalolbittif - You think something's funny but you're too chicken to laugh

You think something's funny but you're too chicken to laugh out loud. It's like you're hiding from your own humor.

'I did a nalolbittif when my friend said 'I’m not a dog.'

'He did a nalolbittif during my mom's epic rant about the dishes.'

'She did a nalolbittif when I said 'I hate Mondays.'