Definition: the ability to understand a toddler who is barely speaking.
Each toddler speaks his or her own language and you, as their mother, can understand a good chunk of their mumblings.
While a bystander might hear "Dasa um nok," you hear "Pardon me mother, but I would like some more milk when you can spare a moment to refill my bottle. Thank you so much. You are very kind and beautiful." Okay, that's probably not the correct translation. It's probably something like "You -- mom-person! Get me more milk NOW!!!!"
See? I am a mom-terpreter!