IG

Either an abbreviation of Instagram or an acronym of "I guess"

Chris: Imma go on IG
Tom: What's IG?

Chris: Instagram

Alisha: My bf gave me a voice message, it says this "I'll see ya later tonight.", but in the background, a girl says "Don't stop doing it."

Allie: He's cheating on you ig.

Alisah: What's IG?

Alle: I guess

ammeg

You are probably someone named Gemma and trying to spell it backwards.

Misha: Hey how do you say your name backwards?
Gemma: I think it's Ammeg