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A fancy way of saying your guts are bubbling like a mad scientist's experiment. Your stomach is throwing a tantrum because of bad food.
After that greasy burger, I had b-geezies so bad I could’ve vomited on my boss.
I ate three tacos and got b-geezies so strong I had to leave class.
My b-geezies hit me mid-video game, and I had to run to the bathroom.