adverb, adverb taking the 'to' particle
gulping down; chugging
Describes drinking a large amount quickly and audibly. Often used with verbs like 飲む.
彼はビールをがぶがぶ飲んだ。
He chugged the beer.
na-adjective
sloshing around (in the stomach)
Describes the sensation or sound of liquid moving in the stomach, often after drinking too much. Used with verbs like する or なる.
水を飲みすぎて、お腹ががぶがぶする。
I drank too much water and my stomach is sloshing.