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dai だい
This is a particle that indicates a WH question in informal speech between males.
Examples:
どの本が数学の教科書だい。
Dono hon ga suugaku no kyookasho dai?
Which book is the math textbook?
あいつはだれだい。
Aitsu wa dare dai?
Who is that guy?
何言っているんだい。
Nani itte iru ‘n dai?
What are you saying?
今、どうするだい。
Ima, doo suru dai?
What will you do now?