Drunk Mode keeps you from being able to send text messages as long as the feature is enabled. If you try to send a text message (iMessages included), then you will receive a pop-up alert that says, “Go home, You are drunk!” The tweak is very persistent, and will continue to block you from being able to send text messages until you disable the tweak.
This is a good feature because you won’t send complete nonsense to your friends and family when you find yourself unable to type on your phone clearly. This can be embarrassing, and might even get people annoyed with you when they can't understand your gibberish and typos.
If you want to enable or disable the tweak, you will find the Drunk Mode toggle right below the Airplane Mode toggle in the Settings application’s main page. The toggle is distinguished by its wine glass icon:
Only, I don't know whether you will remember to set up this mode before you get drunk with a clear realization in mind that you know you are going to get drunk!
