Moolin

Taking it easy; deep chill; relaxed; hanging out

"I'm just 'moolin' man"
"Naw were moolin"
"Hey we moolin tonight or going out?"
Moolin would be the same as "boolin" or "coolin" but as I say all of those quite often it's bound to be brought up in conversations regularly.

Boolin

Boolin is used as a sub word for relaxing, chilling, and hanging out.

Just boolin boy (another word for coolin).

AYYY we boolin (hanging out).