Sounds as if it could have been a glitch, Azurewolf...but knowing some of the kooks and creeps in IRC, the guy could have sent you a "bomb" without you knowing about it. Did you have a DCC connection at the time as well?
A good thing to do is get a "finger" utility so that if anyone tries anything like that you can finger them and get their ISP information. That may have been what he(?) was doing to you.
