Wouldn't normally link to something as highly trafficked as Yahoo, but this was just too good.

Doctor Slang
Plumbum oscillans is Latin for swinging the lead
UBI is unexplained beer injury
PAFO is pissed and fell over
ATFO is asked to fuck off
Code Brown refers to a faecal incontinence emergency.
DBI is dirtbag index. This is a formula which multiplies the number of tattoos on the patient's body by the number of missing teeth to estimate the total of days he has gone without a bath.
CTD is circling the drain
GPO is good for parts only
Rule of Five means that if more than five of the patient's orifices are obscured by tubing, he has no chance.
GOK is for God only knows
FLK means funny looking kid
NFN signifies normal for Norfolk, a rural English county

Lasagnafarm adds its own
HS,WT? is holy shit, what is that
TFP is totally fuckable patient
GMC,I is get my coffee, intern
FP.SCETS! is famous person, someone call Entertainment Tonight, stat!
ITAWWAD is I thought Anna Wintour was already dead
PIDJDT is pretend I didn't just do that (often said when having to unsew a patient to retrieve a forgotten tool)
Rule of Doh! says that if a doctor does three things in a day that Homer Simpson would have done, he must submit to a barium enema