Done by underage males, a guilt free beer run is an average beer run except that the person committing said beer run slams down exact change or more than the cost of the beer on his way out. This means he will not have to show his ID yet doesn't feel guilty to the clerk for "stealing." This is a prime example of a situation in which everyone wins as the underage male gets his beer and the store clerk is paid the money owed but cannot be reasonably held responsible for allowing a minor to purchase said alcoholic commodity.
18 year old Doug: Here have a beer, we did a beer run earlier.
18 year old James: You're a dick! The poor attendant is going to have to pay for the missing merchandise!
18 year old Doug: Nah don't worry bro, it was a guilt-free beer run; I slammed down correct change on the counter as I ran out!
18 year old James: Oh ok, pass me a cold one then!
1) The act of having to leave one's present location (house, apartment, yacht, etc) during a social gathering so as to acquire more beer. This typically occurs when the previous supply of beer has run dry, thus necessitating the need to "run out and get some more beer," i.e. "beer run."
2) Term used by underage kids for grabbing beer and running out of the store with it. This is a misuse of the term, as the preferred nomenclature is "shoplifting."
3) Song by Garth Brooks and George Jones, stolen from Todd Snider.
1) "Yo, the fridge is empty. Time for a beer run."
2) "Wanna go on a beer run?"
"No, you're sixteen, shut up."
3) "B double E double R U-N, Beer Run, Beer Run...."