かい

turns a sentence into a yes/no question

へへへ、 女おんなに 振ふられたのかい？
おめえ 早はやいとこ 帰かえんな、ママが 心配しんぱいしてるぜ。

Hehehe, were you dumped by a woman? (Yes or No)
You better run home, mummy would be worried about you.