This is the 5816th most frequent Japanese word.
ぱく
"ぱく" (paku) is a slang term often used to describe the act of eating or biting quickly, or sometimes stealing/snatching.
Here, "ぱくぱく" represents the sound or action of eating enthusiastically, often used in an onomatopoeic context.
彼はケーキをぱくぱく食べた。
He ate the cake eagerly.
In this sentence, "ぱくっと" describes the quick action of taking a bite, emphasizing the act of eating.
彼女はアイスをぱくっと食べた。
She quickly ate a bite of the ice cream.
"ぱくっと" here conveys the imagery of swallowing in one action, illustrating the sound and motion closely tied to eating or swallowing.