I found these on the PKR forums ...

/atlast - at last
/brb - will be right back
/boo - boo
/bosh - bosh
/bravo - bravo
/bringiton - bring it on
/bye - bye =will see you
/cheer - cheer
/chicken - chicken
/chuckle - chuckle
/clap - clap
/congratulations - congratulations
/cough - cough
/crikey - crikey
/cry - cry
/cu - see ya
/dance - dance
/drum fingers - drum fingers
/dude - dude
/fan - fan (op jezelf = on fire)
/finally - finally
/flirt - flirt
/frown - frown
/gasp - gasp
/gb - good bet
/gc - good call
/gf - good fold
/gg - good game
/gl - good luck
/grin - grin
/grr - grr
/hello - hello
/hi - hi
/iyf - in your face
/kiss - kiss
/laugh - laugh
/lmao - laugh my ass off
/lol - laugh out loud
/loser - loser
/nh - nice hand
/niceone - nice one
/no - no
/nk - no kidding
/np - no problem
/nty - no thank you
/noway - no way
/omg - oh my god
/oops - oops
/orly - oh really
/owned - owned
/phew - phew
/rude - up yours
/shake head - shake head
/shame - shame
/shutup - shut up
/smile - smile
/sorry - sorry
/stretch - stretch
/sweet - sweet
/ty - thank you
/think - think
/thumbsdown - thumbs down
/thumbsup - thumbs up
/time - time
/tut - t
/typical - typical
/unlucky - unlucky
/wp - well played
/whatever - whatever
/wink - wink
/yawn - yawn
/yay - yay
/yes - yes
/yw - you're welcome