Meaning 1:
A word used to reply to a funny message sent by someone that you're thirsting after. It is the ideal response if you want to seem cool and confident, because simply saying "haha" is plain and can come across as overly keen, whereas no laughter at all just makes you sound like a sociopath.
Meaning 2:
A nervous laugh. Basically used to tell the person they'reweird in a nice way.
Sophia: Do not remember doing this lol but 👋 to you
Sabrine: Aha thanks, nothing better than an unintentional wave
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.