Hey-i've heard of such things happening- is it kind of seeping or is it an ejaculation? but either way- i agree with Sal200- u should go and see a doctor about this problem. I've heard of serious problems causing this like tumors or minor things causing this that are easily correct. You should definitely go and get checked out!!!
Woo boy never heard of such a thing, maybe one of the valves to your testicles are loose ask an expert