唔小心露出性感部位 (to expose oneself inadvertently, often used in a sexual way; literally: to run light)
動詞Examples
嗰個女歌星成日著埋啲咁性感嘅裙,都唔知係咪想特登走光搏出位。
The actress often wears revealing dresses, isn't she trying to gain attention through her outfits?
未沖洗嘅菲林唔小心曝咗光,用唔到 ((fig.) (of film) to be exposed to light)
Examples
啲菲林走咗光就晒唔到相架嚹。
If a film is exposed to light, the photos can't be developed.