doro-doro（ドロドロ）
doro-doro describes a thick, heavy, and viscous state, often referring to substances with low fluidity that move slowly, like mud or magma, as well as emotions or relationships that feel dense or entangled.
dokan（ドカン）
1. A loud explosive sound
doki-doki（ドキドキ）
doki-doki describes the rapid beating of the heart caused by excitement, nervousness, or anticipation.