/usr/share/ircII/script/meta2 is in ircii 20151120-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # $eterna: meta2,v 1.2 2001/08/12 15:57:11 mrg Exp $
#
# TAB becomes the META2 key here...
#
bind ^i meta2
bind meta2-^i toggle_insert_mode
|