I have a real problem with the phrase, "it's five o'clock somewhere." Allow me to explain.
First of all, in order for the statement to be accurate, it can only be made on the hour. The logic of this seems lost on most people. Consider the popular country song "It's Five O'Clock Somewhere," by Alan Jackson. The chorus goes, "It's only half-past twelve but I don't care. It's five o'clock somewhere." Sorry A-Jax (nickname patent pending), it's actually five thirty somewhere. And also, you're an idiot.
Secondly, if you want to have a drink before five, just do it and shut yer yap. I guarantee that anyone who'll judge you for getting sloshed during the day won't be swayed by your proclamation that that it's drinkin' time in Guam.