Someone ( typically someone with a more stern outlook on life )'s sweeter side, this may be referring to just a nicer side of the person, or having a [crush[ on someone,
"Have you seen Person A's sweetside? I noticed them showing that side of them a few days ago!"
A female passenger in your car whose always telling you that you drive too slow, your turning too fast, controls your radio, and generally critiques everything you do while driving. Often times calling you a grandpa when your in your mid 30s.
Meghanns such a side seat sally but won't drive the car herself. Just tells me im a grandpa behind the wheel all the time.