Used to describe sketchy situations. Usually, a person says the word "straight" before describing something as gummy buzzin. Can also be used in place of the word trippin.
"I got a flat tire on my way to work, then my manager yelled at me for being late!"
"Bro, that's straight gummy buzzin!"
"What's she all mad for?"
"I don't know, man, she's straight gummy buzzin."