To try hard and succeed.
(Girlbossing is implied)
Person 1: Look at her run! She's gusting!
Person 2: I'm gusting so hard in maths right now.
To be affectionately messy and disgusting.
Pronounced: gruhn (as in grunge) - guhl (as in seagull)
Person 1: I feel like a grungle today.
Person 2: You're so grungly.
To be excelling at an activity with class and grace.
Person 1: Look at her dancing... she's seasoning.
Person 2: My writing is so seasoned.