ALLY, ALLY OXEN FREE written by ROD MCKUEN/STEVEN YATES It was recorded by The Kingston Trio. General consensus among people who study things like this is that “Olly olly oxen free” is a mutation of something like “All ye out come in free.” (Meaning, back four centuries ago when we have the first known games of hide-and-seek) that anyone still hiding (out) can come back without getting tagged (free)