ごくごく (goku goku) Gulping Sound

【 ごくごく・goku goku 】gulping sound

麦茶(むぎちゃ)をごくごくと()んだ。
(mugicha wo goku goku to nonda)
gulped down barley tea

ビールをごくごくと()んだ。
(bīru wo goku goku to nonda)
I gulped down the beer.

*()む (nomu) = drink

Japanese is rich in onomatopoeic expressions (4500!) and are useful for articulating a sound, state or emotion.