1. A class of hacker attack whereby the victim is flooded with information. Examples: The DDoS attacks of early 2000 Major websites where flooded with traffic, clogging their 1-gbps high-bandwidth Internet connections. IRC A user in the chat room is flooded with commands, or the user's client is triggered into flooding the server with commands. Either way, the user has to log out or is kicked off. RalF In the olden days, a UNIX command that looks like ls / -RalF > /dev/tty1 would flood a user's terminal with huge quantities of text, forcing them to logout. stick/snot By generating a steady stream of spoofed, random/meaningless attacks, these tools flood the IDS console, making it impossible for the operator to discover real attacks. From Hacking-Lexicon

2. v. [common] 1. To overwhelm a network channel with mechanically-generated traffic; especially used of IP, TCP/IP, UDP, or ICMP denial-of-service attacks. 2. To dump large amounts of text onto an IRC channel. This is especially rude when the text is uninteresting and the other users are trying to carry on a serious conversation. Also used in a similar sense on Usenet. 3. [Usenet] To post an unusually large number or volume of files on a related topic. From Jargon Dictionary