Two different types:
Stomach Rumblies: when you can feel a
rumbling sensation in your stomach and know that you're either going to throw up or drop
deuceAss Rumblies: when you feel a rumbling sensation in your ass and you need to find a bathroom
asap
ie: "Dude, that
Dominoes is definitely giving me the
rumblies right now"
"Stop this car right now, I
have the ass rumblies and I need to go so bad I'm getting cold sweats"