When mothers or mother-like figures put their arm in front of your body as if to guard you from an impending threat.
May occur if:
a) Your mom is driving and must suddenly stop short, break hard, or perform any other semi-dangerous driving maneuver especially in response to someone else's bad driving
b) If you are about to cross a busy intersection and she wants to protect you from oncoming traffic and/or keep you from crossing before she gives consent
Mom enacted a Maternal Hand Save when a car suddenly turned in front of ours.