A patter is a series of quick, quiet, tapping sounds.
例句
...the patter of the driving rain on the roof.暴雨打在屋頂上發出的啪嗒聲
N-SING
（通常以娛樂、推銷或勸說為目的的）順口溜，伶俐話，連珠炮似的叫賣語
Someone's patter is a series of things that they say quickly and easily, usually in order to entertain people or to persuade them to buy or do something.