Just hypothetically speaking would a human body with no space suit or breathing apparatus implode or explode in the zero gravity of space?

It's not the zero gravity which gets you, it's the vacuum, which would cause some degree of explosion. In our normal environment we are surrounded by air with a pressure of 24 pounds per square inch, so when that pressure is removed, there is a lot of internal pressure that will expel gas and fluid (the fluid will also be boiling, because it is the pressure of the air which normally keeps water or aqueous fluids from boiling at normal body temperature). But although parts of the body will explode, most of the body will remain, it's not like a bomb going off and leaving nothing but an expanding cloud of debris.