Mkay is a non-standard spelling of Okay, representing an informal pronunciation, typically used at the end of a statement to invite agreement, approval, or confirmation. It's made popular by Mr. Mackey on the Comedy Central animated sitcom South Park. It can be used in place of OK. 

Mkay是Okay（行，好）的不规范拼法，代表一种非正式发音，通常用在句尾来征求同意、认可或进行确认。这一说法因美国喜剧频道播放的动画情景喜剧“南方公园”里的麦基先生流行起来。mKay可以用来代替OK。

Mkay的美式发音为[m:'kei]，除了mkay，mkay、mmkay、mmmkay也有相同的意思，其实读读这个词，你就能体会到说它时随意的感觉。