a. 被打得头昏眼花的, 傻呵呵的
在线英汉词典

slap-happy的短语、例句：

slap-happy adj (infml 口) cheerfully irresponsible; carefree 马大哈的; 粗心大意的; 无忧无虑的
too slap-happy in his attitude to schoolwork（他）对功课太马大哈.