This is the 5877th most frequent Japanese word.
ぽか
"ぽか" (poka) refers to a feeling of warmth or mildness, or can imply a foolish mistake depending on context.
In this sentence, 'ぽかっと' is used to describe a light tapping or hitting motion, typically with a playful or gentle nuance.
彼はぽかっと頭を叩いた。
He lightly hit his head.
Here, 'ぽかぽか' describes a gentle warmth, often associated with sunny and pleasant weather.
ぽかぽかと太陽が輝いています。
The sun is shining warmly.
In this example, 'ぽかん' expresses an action or state of being dumbfounded or in a daze.