The phone call was so staticky that I could barely hear the other person.

staticky 是形容词，由名词 static（静电干扰）加上后缀 -y 构成，表示"充满静电干扰的"。static 本身指电子设备中产生的干扰信号，常表现为"沙沙"的噪音声。staticky 形容通话或广播中因静电干扰导致声音不清晰的状态。