mud splash; mud spatter
Refers to mud splashing up, typically from a vehicle or while walking, and the resulting spots on clothing or surfaces.
A car passed by and my pants got splashed with mud.
雨の日は泥はねに注意してください。
Please be careful of mud splashes on rainy days.
Standard spelling using the common kanji 泥 for 'mud' and hiragana for the suffix.
Alternate spelling using 跳ね (to splash/jump), but less common than 泥はね.
Compound of 泥 (doro, 'mud') and はね (hane, the noun form of 跳ねる haneru, 'to splash').