Going full bore into something without caring about the consequences. For example, getting into a shower after a full two day bender and falling asleep for two hours, or falling head over heels in love and getting engaged within a month.
'I can easily see myself go Full Reuben on her.'
'I went out on Friday and woke up on Monday morning. I now have a belly button ring and a questionable tattoo. I went Full Reuben.'