This thread contains the known phrases for communicating Cross-Faction.
All of the phrases are from Project Azeroth.
If you have any phrases you know work and aren't on the list, post and I'll add it!
I searched for a few keywords I thought might be related, didn't see much come up. I do admit I didn't search that hard but, oh well.
I saw another thread with the translation of certain words, i.e. if an Alliance member said "Hamburger" it would come out as "Blahblahblah" as the Horde. I have a list from Project Azeroth of phrases you can directly use.
ALLIANCE (And Undead)
Project Azeroth says that you can say the following in either Common or Gutterspeak.
Here are some for the Alliance (and Undead), to help communicate with the Horde (and Alliance if you're Undead):
On the left is the word you'd want to say, and on the right is what you should type in /y.
Result > Common/Gutterspeak
an > pp
any > pp d
anyone > pp d a zz
bore > xxx b
borne > clear
bury > ggg d
ever > b fff
every > b fff d
everyone > b fff d a zz
eye > b d b
far > hhh
loan > ee pp
loose > ee a bb
lose > ee bb
love > ee oo
lover > ee fff
me > ss
mean > ss pp
mere > ss aa
mod > eee
mode > eee b (CONFIRMED)
never > zz fff
VIEWER DISCRETION IS ADVISED:
N l G G A > L t A A F (CONFIRMED. I got reported for this once...)
VIEW DISCRETION IS UNADVISED.
one > a zz
over > a fff
re > aa
reverse > aa fff bb (CONFIRMED)
see > bb b
severe > bb fff b
tie > jj b
time > jj ss
use > p bb
value > cc hh b
very > fff d
you > d a p
erase > b ddd b
evil > b ppp
fare > hhh b
hire > bbb b
meantime > ss pp jj ss
overtime > a fff jj ss
retire > aa jj aa
reuse > aa p bb
verse > fff bb
vile > ppp b
yeti > d b jj (CONFIRMED)
I have confirmed a few of these work. Yesterday I found a level 80 druid kiting Anachronos to Orgrimmar so I followed him most of the way and when the Horde killed me he would wait and then we'd keep going, but I digress. We went of to Azshara and I said to him:
/y aa fff bb
/y eee b
By looking above you can see that it should say reverse mode. When I said it he got on his mount and started to move backwards for a while, so I assume it can be confirmed as working.
Now here's some for the Horde, to assist in communcation with the Alliance. Unfortunately, there aren't as many, but some of them are still good :P
HORDE
Result > Orcish
Zug Zug > 101 101
HA HA > UO UO
mu ha ha > 27 11 11
L O N G > D E X A
L A G > D F Z
L O L > U G O
no > X C
no > aw
ha > ms
Grom > wery
kazoom > garde
kil > jkl
PS: If this is a repost..then uhh...FLAME ON!!!!!