Dumb

:~/ -- Mixed up
%-) -- Braindead
(:I -- Egghead
<:-I -- Dunce
=:-) -- Hosehead
:-] -- Smiling blockhead
:-[ -- Un-smiling blockhead
|-O -- Yawning, tired
|-I -- Sleeping
:-6 -- Exhausted; wipeout

Affection

@}--,--'-- -- Long-stemmed rose
: * -- Kisses
:-X -- A big wet kiss!
:-x -- Kiss kiss
:-{} -- Blowing a kiss
[hugged person's name] -- Hugs
((hugged person's name)):** -- Hugs and kisses
((((person's name)))) -- Hug

Schedule

A3 -- Anytime, Anywhere, Anyplace
ATK -- At the keyboard
BAK -- Back At Keyboard
BBL -- Be Back Later
BBS -- Be Back Soon
BHL8 -- Be home late
BRT -- Be Right There
CU@ -- See you at (time or place)
h2cus -- Hope to see you soon
F2F -- Face to face
JstCllMe -- Just call me
L8 -- Late
L8r -- Later
RU CMNG -- Are You coming
T2Go -- Time to go
Wan2 C a moV? -- Want to see a movie?
WRU -- Where are you?
W4u -- Waiting for you
W8 -- Wait
W84M -- Wait for me

Miscellaneous

:-* -- Oops!
:-I -- Indifferent
\-o -- Bored
:-P -- Tongue hanging out in anticipation
O :-) -- Angelic
:-? -- Smoking a pipe