erc-fill-mode
erc-fill-mode is an interactive autoloaded compiled Lisp function in `erc-fill.el
'.
(erc-fill-mode &optional ARG)
Toggle ERC fill mode.
With a prefix argument ARG, enable ERC fill mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.
ERC fill mode is a global minor mode. When enabled, messages in
the channel buffers are filled.