i-adjective
Colloquial, often affectionate or childlike way to say something is small in size. Used in casual speech.
See also: 小さい
この犬、ちっさくてかわいいね。
This dog is so tiny and cute, isn't it?
I used to play here a lot when I was little.
i-adjective
Colloquial use for describing a sound or voice as low in volume or soft. Less common than the size sense.
See also: 小さい
ラジオの音がちっさくて聞こえないよ。
The radio is so quiet I can't hear it.