Wife/dinner/etc ack: Play time over due to external (or is it infernal?) influence
Tater: 30mm or other atypically large aircraft-mounted cannon, generally in reference to the 109K-4
Lawndart: A porker and/or vulcher who forgets to pull out of his dive
Pork: To destroy a resource at an airfield. Generally referring to fuel, ordinance and troops. Porked: A porked resource is one either no longer available (IE, troops and ordinance) or reduced (fuel) at a given field
Astronaut: A bandit flying at ludicrously high altitude, so far above the engagement that there's really not even a point to him being up there
Ack-Ack: See Astronaut (

)
Bish: See Astronaut
UFO 1: See Astronaut, VERY frequently used in reference to N1K2s 2: Mysterious dots that appear in the sky, LOOK and generally even behave like another plane outside of con range, but aren't actually anything.
Foofighter: The historical term (seen it in the MA once or twice) for UFO #2.
Dweeb: A Spit or ElGay pilot

Hog: F4U
Mildcat: F4F/FM-2 (I personally don't like that one. You gotta fear the kitten

)
ElGay: Generally La7, but sometimes applied to the La5 (only moderately ghey)
Dweebfire and the billions of permuations of: A Spitfire of any type(duh)
Vulching: It's called BASE SUPPRESSION, DANGIT!
Furballers: Pilots who don't like to blow up ground targets or "win the war" and spend their time flying around in circles

Toolshedders: The opposite of the furballers. WARNING: Furballers and Toolshedders are HIGHLY incompatible, and mixing of the two in one thread generally yields explosive results. If you must store Furballers and Toolshedders together handle with care and do not expose to open flames.
Fun Police: A pilot, or group of pilots, seen to be spoiling the fun of another group of pilots by trying to forcibly impose THEIR idea of fun. Generally but not exclusively used in reference to dropping fighter hangars, sinking carriers or otherwise preventing the enemy from feeding a furball by using bomber formations to attack strategic/tactical targets. Note that the application of this term is highly subjective and not in all cases accurate.
Ack: Generally, any type of fixed surface-to-air weapon, including manned and unmanned gun emplacements, 5" guns aboard the task groups and "puffy ack" (traditional flak).
Cheater: While at times this term CAN be applied based on its true definition, it is more commonly used by inexperienced pilots to explain why a veteran was able to school their oscar. Frequently in cases where the newbie is flying an advanced late-war fighter and gets their butt handed to them by an inferior or early-war aircraft.