n A (usually disastrous) overflow of water from a lake or other body of water due to excessive rainfall or other input of water.
n (figuratively) A large number or quantity of anything appearing more rapidly than can easily be dealt with.
v (figuratively) To provide (someone or something) with a larger number or quantity of something than cannot easily be dealt with.
v (context|Internet|computing) To paste numerous lines of text to a chat system in order to disrupt the conversation.