Awa

Awa is a way to define cuteness and extreme happiness, usually goes towards love. Sometimes though it might have a sad meaning to it, like if your friend were to leave at a party you'd be sad so you say "awa" Other times where you are in a conversation with your partner and they say something cheesy, cute or super adorable you would say awa. Awa doesn't mean anything with foam. Awa in Japanese means foam but this has nothing to do with that. It's just a sound or reaction.

Y: Ily sm.
X: AWAA ♡

Or

Y: Oh man i gtg.
X: awaa... okayy, byeee

RA

RA is a weird saying. It doesn't have a meaning and its not a slang. It's used to say something like "woah" or "that's so dumb/funny/smart". It's usually supposed to be written in all caps to give out that feeling of RA.

Example:

Some guy:"Dude i just got an A in math"

Other dude: "RA"