The phrase "outboard side" refers to the outer or farther side of something, usually a vehicle or a boat. It means the side that is located away from the center or towards the edges. Full definition
Up front, the top and outboard side of the corner vents on the fascia have a large black insert. (topspeed.com)
* This Ford F - 150 Features the Following Options * SOS post crash alert system, SecuriLock passive anti-theft system (PATS), Safety Canopy front / rear outboard side curtain airbags, Removable tailgate w / key lock & lift assist, Remote keyless entry key, Rear pwr point, Pwr rack & pinion steering, Pwr front / rear disc brakes, Pwr door locks w / autolock feature, Perimeter alarm. (smartcarguide.com)
* These Packages Will Make Your Ford F - 150 Lariat The Envy of Your Friends * Safety canopy front / rear outboard side curtain airbags, Removable tailgate w / key lock & lift assist, Remote keyless entry key, Rear window defroster, Rear pwr point, Rear privacy tint glass, Pwr sliding rear window, Pwr rack & pinion s... (smartcarguide.com)