、？
Are you washing that green striped shirt right now?
Literal
That green [genitive-の] striped [genitive-の] shirt, now laundry-doing [question-ん]?
Casual, spoken Japanese. グリーン (loanword for 'green') and シャツ ('shirt') are both English-origin katakana words. 縞 (しま, 'stripes') is used as a noun modifier with の. 洗濯してるん is a contraction: 洗濯している + の → 洗濯してるん, where ん is the casual spoken form of the explanatory の used as a question marker. The sentence lacks an explicit subject or question particle か — the rising intonation (implied by the casual ん) does the questioning.