"Koastin". When sombody is just chillin and going with the flow. Usally happens when they smoke that good weed. Also may occur when a fine female is flirting. The word is basically diverse and can used to define any situation.
Person One: "Yo What Is Good My Nigga?"
Person Two: "Shit You Know Me, Just Koastin©"
Person One: "Yoo Nigga, I Just Smoked A L, Now Im Finna Koast."
Person Two: "I Feel Yuh"