An onomatopoeia describing something bumpy or dotted with small lumps (e.g., a rash or pimples); used adverbially to describe a surface that's knobbly or pimply.
季節の変わり目で顔にぷつぷつと赤い発疹が出た。
At the change of seasons, red pimply bumps appeared on my face.
背中がぷつぷつしてかゆいので、皮膚科に行った方がいい。
My back has bumpy itchy spots, so it's better to see a dermatologist.
表面が古くてぷつぷつしている道路は自転車で走りにくい。
A road whose surface is bumpy is hard to ride a bicycle on.
A mimetic term describing something that breaks or cuts off easily into small pieces — often used in expressions like 'putsu-putsu cut off'.
この古い糸は弱っていて、引くとぷつぷつと切れてしまう。
This old thread is weakened and snaps off into little bits when pulled.
紙を濡らすと端がぷつぷつと崩れやすくなるから注意して切ってください。
Be careful when cutting wet paper because the edges tend to crumble and break apart.