Short for registration. A term used for some online
games that manage to lose packets in the transfer between
client and server, specifically counter-strike
where it is possible that a direct hit to the head (or any other
part of the body) not be registered by the server resulting in no kill and agrivation. Often people get annoyed with this stupid aspect of online gaming
"I just shot
that guy in the head, didn't get any rego though"
"Im so tired of this rego, when
i shoot it never hits."