AC - Air conditioning
Azure - Azure blue (paint colour)
Banana - Banana shaped front suspension arm
BCM - Body Control Module
Blade - Blade silver (paint colour)
Blackfire - range of wax and cleaning products
BT - Blue Tooth adapter
CAI - Cold Air Induction kit
Da Whip - Legendary escaped mental patient
De-cat - removing the catalytic converters from the exhaust, usually to improve noise
Dodo - DodoJuice detailing products
Ebisu - Ebisu black (paint colour)
ECU - Electronic Control Unit
Falkens - Tyre manufacturer
FI - Forced Induction (turbo/supercharger)
GM - Gunmetal Gray (paint colour)
GT - Factory option GT pack including leather, Bose, electric seats and cruise control
GT4 - 350z that is Model Year 03 with Model Year 06 engine. Black Or Yellow only.
GTR - Yes please!
Halfrauds - Popular high street motor factor
HFCs - High Flow Catalytic Converters
IMO - In my opinion
IMHO - Im my honest / humble opinion
IIRC - If I remember / recal correctly
JDM - Japanese Domestic Market
Kuro - Kuro Black (paint colour)
LM GT4 - 19" forged alloys branded Nismo but made by Rays, an upgrade from Nissan dealers but available cheaper elsewhere and in 18"
MY06, MY05 etc - Model Year (350z has MY03, MY06, MY07)
NA - Normally Aspirated (i.e. no turbo/supercharger)
Night Blue - Night Blue (paint colour)
NISMO - Nissan's motorsports brand, marketing a number of upgrades including wheels, exhaust etc.
NTB - Nissan Technical Bulletin
OEM - Original Equipment Manufacturer (genuine Nissan)
Offset - Distance between the centerline of the wheel and the the hub
Pee spouts - windscreen washers
P1; P2; P3 - servicing intervals (ANYONE KNOW OF LINK THAT SETS OUT WHAT IS DONE?)
PM - Private message
Popcharger - Induction kit manufactured by Jim Wolf Technology (JWT)
Ragtop - convertible version
Rays - lightweight forged wheels, initially optional but later standard fit (so called because of the Japanese manuafacturer Rays)
Roadster - convertible version
SC - Super Charged
Spacers - Spacer between the Alloy and the Hub
Sprinkle - Female member of the club
SS - stainless steel, often used in the context of aftermarket exhausts
Stones - the original fit Bridgestone tyres, known for their poor weather grip
Stubby - shorter aerial
Sunset - Sunset Orange (paint colour)
Temper - Temper Orange (paint colour)
TT - Twin turbo
Toyo's - Tyre Manufacturer and Tyres for Welsh people
UY - Ultra Yellow (paint colour)
Val - ....
Version S - Import model (sporty)
Version ST - Import model (top spec)
Version T - Import model (luxury)
VQ35DE - Engine used in 2003 to 2006 Zeds also known as 276
VQ35DE Revup - Engine used in 2006 to 2007 Zeds (and GT4) also known as 296
VQ35HR - Engine used in 2007+ Zeds also known as 313
Volks - lightweight forged wheels
Wow! - reaction from children at bus stops as you drive past
Yokohama - Tyre Manufacturer
Zed - Nissan 350Z (in UK)
Zee - Nissan 350Z or Neeson 350Zee (in US)
Pulled from another thread suggested by Ebized, feel free to add suggestions below and I'll add them in here.
The thread will also be tidied when the new suggestions are added so if it's a silly suggestion don't worry, it'll be deleted afterwards!