I believe it means what the height temperature is.
It means Low temparature
When a teacher you know says hi to you it means they are being polite and acknowledging you.
Nothing. He is being nice. Say hi back.
He's flirting.
It could mean that or he is just trying to be nice.
it means he is complementing you but is a little odd.
crush
He really likes you
well i guess they are obviously nice!
If a person says hi to you and then laughs, they may be a shy person who doesn't know what else to say. Just say hi back to them and make a new friend.
it means hi or hey what's the matter
It means he likes you - a lot.