OP - Operator (as in name)
OM - Old Man (any male ham is an OM)
ANT - Antenna
BTU- Back To You
U - You
R - can be used in a sentence as the word "are"; or to indicate "Roger"
FB - Fine Business
GA - Good Afternoon or Go Ahead
GM - Good Morning
GE- Good Evening
GN - Good Night
QTH - Location
QRL (?) - The frequency is in use, and can be used in the form of a question, "Is the frequency in use?"
QRS(?) - Can be used in the form of a question to "please send slower?"
QRM - Manmade noise / interference (power line noise, other operators)
QRN - Natural noise / interference (static, lightning crashes, etc)
QSB - fading signals (rising and falling signal strengths due to band/propagation condx)
CFM - Confirm
TU; TKS - Thank You
NR - Near; or Number (usually used in a contest)
WID - With
PWR - Power
HW? - How?, used like How are you?....How do you copy?, etc
CPY;CPI - Copy
HR - Here
MNY - Many
FER - For
QLF - I'm sending with my left foot; used tongue in cheek humorously
QEW - I'm having difficulty hearing due to buildup of ear wax.
QRF - Arthritis is acting up today