Definition
This phrase is used to express a strong refusal to someone's suggestion or request.
想都別想！
"Do you think I'm going to help you with this?" "Not on your life!"
「你覺得我會幫你這個忙嗎？」「想都別想！」
"Will you tell anyone my secret?" "Not on your life!"
「你會把我的秘密告訴別人嗎？」「絕對不會！」
"Would you ever go on a date with him again?" "Not on your life!"
「你會再跟他約會嗎？」「絕對不可能！」