What is rumblin?

When an anus disperses a gaseous cloud.

Described as a rumblins!

When she bent over I sensed the rumblins of a storm.

rumblin - meme gif

being all around crazy and or stupid (either in a god or bad way)

Good way: "Yo man, you were straight rumblin at that party last night!!"

Bad way: "Dude. Chill out. Quit rumblin. you're pissing me off."