From the Meaning of Liff
CORRIEARKLET (n.)

The moment at which two people approaching from opposite ends of a long
passageway, recognice each other and immediately pretend they haven't. This
is to avoid the ghastly embarrassment of having to continue recognising each
other the whole length of the corridor.

CORRIECRAVIE (n.)

To avert the horrors of corrievorrie (q.v.) corriecravie is usually
employed. This is the cowardly but highly skilled process by which both
protagonists continue to approach while keeping up the pretence that they
haven't noticed each other - by staring furiously at their feet, grimacing
into a notebook, or studying the walls closely as if in a mood of deep
irritation.

CORRIEDOO (n.)

The crucial moment of false recognition in a long passageway encouter.
Though both people are perfectly well aware that the other is approaching,
they must eventually pretend sudden recognition. They now look up with a
glassy smile, as if having spotted each other for the firt time, (and are
particulary delighted to have done so) shouting out 'Haaaaaallllloooo!' as
if to say 'Good grief!! You!! Here!! Of all people! Will I never. Coo. Stap
me vitals, etc.'

CORRIEMOILLIE (n.)

The dreadful sinking sensation in a long passageway encounter when both
protagonists immediately realise they have plumped for the corriedoo (q.v.)
mutch too early as they are still a good thirty yards apart. They were
embarrased by the pretence of corriecravie (q.v.) and decided to make use of
the corriedoo because they felt silly. This was a mistake as corrievorrie
(q.v.) will make them seem far sillier.

CORRIEVORRIE (n.)

Corridor etiquette demans that one a corriedoo (q.v.) has been
declared, corrievorrie must be employed. Both protagonists must now
embellish their approach with an embarrassing combination of waving,
grinning, making idiot faces, doing pirate impressions, and waggling the
head from side to side while holding the other person's eyes as the smile
drips off their face, until with great relief, they pass each other.

CORRIEMUCHLOCH (n.)

Word describing the kind of person who can make a complete mess of a
simple job like walking down a corridor.
( The Coast Of Yemen, Mon 29 Oct 2007, 14:52, Reply)