A distinctive emotional quality or atmosphere that is sensed or experienced by someone: a nostalgic vibe to the decor; a stranger who gave off bad vibes.

What does it mean to be vibing?

Vibing is always positive, and means to chill or agree with someone.

What is this word vibin?

Vibin' means chilling/relaxing, enjoying time, or overall just having/receiving good vibes (feelings) from your surroundings. It could also be used to express liking of something/someone like "I'm vibin' that girl over there" or "I'm really vibin' this music"