gulping down (a drink); guzzling; chugging
sloshing around (of liquid in one's stomach)
水をがぶがぶ飲んだ。
I gulped down water.
ビールをがぶがぶ飲むな。
Don't guzzle the beer.
暑くてがぶがぶ飲みたい。
It's hot and I want to chug drinks.