The latest update to Google Search, which is rolling out right now, brings automatic parking spot pinning through its Google Now platform.
The feature is on by default, and will show an approximate location of your vehicle if driving is your main source of transportation. Using your device's sensors, Google determines when you leave a moving object and interprets that as a parking location.
Now if you took a bus or got a ride from a friend, this information will also register as a parking spot, so the mechanism may need to be adjusted for your individual needs. Tap the three-dot menu button to configure settings.
To disable the feature completely, simply select "No" when asked if you want to keep receiving reminders about parking.
The update also allows you to set nicknames for contacts, such as "mom", "sister", etc. Simply open the voice prompt and say "XX is my YY".
Head to Settings -> Accounts & privacy -> Nicknames to view your set nicknames. You can also change or remove them but saying "XX is not my YY". Pretty neat.
If the update hasn't yet hit your device, you can grab it directly here, just make sure to have "Unknown sources" enabled in your Security settings.