Bash (http://bash.org) is an IRC quote database, or specifically a database of funny quotes.
Bash has a moderation system of sorts to allow the general public to vote on which quotes they find funny, and those which they don't, which can then be used by users in the future to browse the quotes using as many filters as they wish.
Anybody can submit a quote to bash, but it has to be very good to get in; quotes are not displayed before they have been added to the database by an editor.
According to dokool, "in terms of the site, bash takes a verb form whenever somebody says something quote-worthy, i.e. "somebody bash that"" - I can't say I've ever seen it myself, but it is very possible that this does happen in certain IRC circles