also: ぴいちくぱあちく
adverb
tweeting; chirping
Onomatopoeic word for the sound of birds tweeting or chirping, often used in casual contexts.
朝から小鳥がピーチクパーチク鳴いている。
Since morning, the little birds have been chirping away.
adverb
chattering noisily
Describes people talking noisily and incessantly, like birds chirping. Colloquial and often carries a slightly negative or humorous tone.
女子高生たちがピーチクパーチクしゃべっている。
The high school girls are chattering away noisily.