Channel - The place you can find other people, it is also called 'Room'.
Server - The computer machine that provide the network, channels and users must connect this.
Kick - Operator of the channel do this to user who does not obey the rules of the channel, it makes the user be forced to leave the channel. It can be taken with Ban (Kick + Ban).
Kill - Operator of the server do this to user who does not obey the rules of the server, it makes the user be forced to leave the server. it can be taken with Ban (Kill+ Ban).
Ban - Operator of the channel do this to user who does not obey the rules of the channel, it makes the user blacklisted from the channel and makes the user can not join the channel which has banned that user. Operator of the server also can do this to user and makes the user can not connect to the server. Usually, bad can be released manually by Operator or automatically with certain time (Banned from Channel: 15 minutes, 30 minutes, 45 minutes, one hour, or longer or may be forever; Banned from Server: 15 minutes, 30 minutes, one hour, one day, two days, one week, one month, three month, or longer, or may be forever).
Lag - A slow connection, it makes you receive chat message from other users lately and also they will read your chat message lately.
Ping - Detecting your lag time by using specific command (example: !ping).
NetSplit - A server failure to connect with another server, it makes you can not see the chat message with another user from different server, it is happening very rare.
Nickname - A short name that used in channel to hide your real name/id.
BOT - Shortness from Robot, it control the channel from user who doesn't obey the rules and kick or ban them automatically. Some of it is equipped with quiz script which can fill the channel with some questions and the users may answer it and listed in quiz rank.
Script - A simple formula to make the IRC program can do something automatically, even the user can make own BOT by write some formula inside the Script Editor of IRC.
Flood - When someone sends chat message repeatedly or sends chat message several times with short of time period (example: 6 lines per second or more).
Shortness
ASL : Age/Sex/Location (Example of Answer: 18 F Paris, it means the user is 18 years old, female, and her location is in Paris).
LOL : Laughing Out Loud
ROFL : Rolling on (the) Floor Laughing
LMAO : Laughing My Ass Off
BRB : Be Right Back
BBL : Be Back Later
BBS : Be Back Soon
TYT : Take Your Time
TY : Thank you
WB : Welcome Back
OMG : Oh My God
CTC : Cam to Cam
AFAIK : As Far As I Know
AFK : Away From Keyboard
ATM : At The Moment
WTH : What The Hell
WTF : What The Fuck
Chan : Channel
Op : Operator
IRCOp : Server Operator (or also called IRC Operator)\
Serv : Server