*Sombody* Trojan (DCC SEND script.ini) from me blocked, see http://bre.klaki.net/programs/tircproxy/trojans.html for information.
This means that "Somebody" tried to send you one of many "trojan horses" that are circulating online. This usually means that the person's computer is itself infected by the program, not that he/she meant you any harm.
These trojans can be very dangerous, and can allow anybody on IRC to mess around with your computer, without your permission. They can also be darn hard to get rid of.
The message is telling you that the attempt was blocked, and so your computer was not infected. You can thank either your ISP or "Somebody's" for installing the freely available tircproxy, which slows the spread of these trojans.
For more information about IRC trojans (how to get rid of them, what they do etc.) and other IRC related security issues, see http://www.irchelp.org/irchelp/security/.