A nickname for the Royal Airforce. But also commonly used by the Army Cadets to refer to an Air Cadet who may religiously play War Thunder and/or DCS in a derogatory manner.
"Toby's such a petrol pigeon, all he does is yap about F-16s and his shitty little Grob Tutor. It's not 1940 the Battle of Britain, he should get over himself."