45C - patient is one chromosome short of a full set (thick)
Beached whale - obese patient unable to do much for him/herself except lie there with flailing arms and legs
Bungee jumper - a patient who pulls on his catheter tube
Code Brown - faecal incontinence emergency (e.g. of bedlinen)
LMC - Low marble count (low IQ)
Negative Wallet Biopsy - (US) patient transferred to cheaper hospital because s/he has no insurance/funds
Ralphie McYakkers - young drunks vomiting