Depending on how quickly decompression took place, your lungs may expand rapidly enough to break your ribs before the air has had a chance to escape through your mouth.
Your veins and arteries may burst internally as the dissolved gasses in the blood come out of solution - similarly with the vitreous and aqueous humours in your eyeballs.
Similarly, gases trapped in your stomach and intestines could cause interesting effects as they expand in the near-vacuum of space.
You would certainly not implode though. An implosion occurs when the external pressure is greater than the internal pressure of an object / system etc.
This is not the case in space.