Going Outside: Leaving the state for any reason.
Lower 48:  The 48 states south of Alaska. 
Cheechako: Anyone new to Alaska.
Sourdough:  Anyone old to Alaska.
Permanent Fund: Money from the state for living in Alaska.
Tin Dog: Snowmobile, Ski-Doo
Mukluk: No...it's not something you just stepped in out there on the tundra, but rather very warm, fur boots usually knee high.
Mosquito Dope (aka Bug Juice): Mosquito repellant: spray, liquid, and roll on. Patches, bracelets, smoke rings, and citronella anything. 

. . .you have more miles on you snowblower than your car.
. . .you're buying a house & you have to ask for water & electricity
      as an option.
. . .you have called an 800 number you found in a catalog and then
      were told "Alaska? Oh, we don't ship out of the United States."
. . .you put up with the pain of a toothache until the Permanent Fund
      Dividend checks come out in October.
. . .you know going "outside" involves a whole lot more than opening a
      door and walking into the yard.
. . .you notice the mosquitoes have landing lights.
. . .you have learned to never say to your kids, "Be home by dark."
. . .you know Bunny Boots aren't worn by bunnies or made out
       of bunnies.
. . .your snowblower gets stuck on the roof.
. . .you think the start of moose season is a national holiday.
. . .you know the meaning of the word "baleen" and it has nothing
       to do with making hay into large cubes.
. . .you take off your shirt and your arms are as pale as your legs all
       the way to your wrists.
. . .you know that the term "Break Up" has more to do with the
       weather than personal relationships.
. . .your monthly phone bill is larger than your house payment.
. . .there is a bottle of Avon's Skin-So-Soft in your tackle box.
. . .you don't know anyone who doesn't own a 4-wheeler.
. . .you have ever taken a trip "outside" and tried to cash a traveler's
       check, drawn on an Alaskan bank, and the cashier asked you
       the current exchange rate in Alaska.
. . .you have ever washed your car while there was still snow on
       the ground.
. . .you have tennis elbow but have never played tennis, just snagged
       a lot of salmon.
. . .you know a honey bucket is really a bucket, but it's not really full
       of honey. (If you don't know, don't ask)
. . .you know the Naknek twitch is an illegal fishing technique, not a
       spasmodic muscle in your neck.
. . .you leave your Christmas lights up, year round, because as soon as
       it gets warm enough to take them down it starts getting dark
       enough to put them up again.
. . .your bedroom windows are covered in aluminum foil.
. . .you had waffle soles put on your cowboy boots.
. . .you know that a "handi-man-jack" is a device designed to lift a car
       to change a flat, not a guy named Jack that comes around
       your house on Saturdays to repair minor problems.
. . .you know a "white out" has to do with winter conditions not
       correcting fluid for typos.
. . .you think it's normal for a town to put all the businesses on
       one side of the road.
. . .you frequently clean grease off your barbecue so the bears won't
       prowl on your deck.
. . .you know which leaves make good toilet paper.