Well, yeah woo!
Ooh

Flew in from Miami Beach B.O.A.C, Didn't get to bed last night
(I'm flying from Miami Beach to finally get back home)
On the way the paper bag was on my knee man, I had a dreadful flight
(Had the air bag on my knee so excited to get back home)
I'm Back in the U.S.S.R
You don't know how lucky you are, Boy Back in the U.S.S.R
( finally back home, so lucky to be safe)
Been away so long, I hardly knew the place Gee
(It has been so long since he's been home it looked way different)
Its good to be back home Leave it 'til tomorrow to unpack my
Case honey, disconnect the phone
( Give Me time to settle back I'll unpack my bag tomorrow and I don't want any calls)
I'm Back in the U.S.S.R
( I'm Back Home)
You don't know how lucky you are, Boy
(Your very lucky to have made it home safe)
Back in the U.S
Back in the U.S
Back in the U.S.S.R
( Back at home)
Well
The Ukraine girls really knock me out
(He has a liking to the Ukraine girls in the U.S.S.R)
They leave the west behind
( The Ukraine girls don't worry about Ukraine)
The Moscow girls make me sing and shout
(He must enjoy Moscow girls and party with them)
That Georgia's always on My, My, My, My, My, My, My, My, My mind
( The Country Georgia that is part of the soviet Union is on his mind)
Oh, Come on!
Woo! (Hey)
Woo! (Yeah)
Woo! (Yeah)
Hell, Yeah
(Let's celebrate me coming home)
Hey, I'm back in the U.S.S.R
(Hey, I'm Back Home)
You Don't know how lucky you are, Boys
Back in the U.S.S.R
( Your very lucky to have made it home safe)
Well
The Ukraine girls really knock me out
(He has a liking for Ukrainian girls)
They leave the west behind
(The Ukraine girls don't worry about Ukraine)
The Moscow girls make me sing and shout
(like to party with Moscow girls
That Georgia's always on My, My, My, My, My, My, My, My, My mind
( The country Georgia is always on his mind)
Oh
Show me 'round your snow-peaked mountains Way Down South
(Take me to the Southern Snowy mountains)
Take me to your Daddy's farm
(Lets go to Your Dads Farm)
Let me hear your balalaikas ringing out
(Let me hear you play your Balalaikas instrument)
Come and keep your comrade warm
( Come here and keep me warm)
I'm back in the U.S.S.R
You don't know how lucky you are, boy
Back in the U.S.S.R
( I'm back home, you are very lucky to be home safe)
Oh, Let me tell you honey
( I need to tell you,)
Hey, I'm Back
I'm back in the U.S.S.R
(I'm Back home)
Hey, it's so good to be home
(It's good to be away from The U.S and back Home)
Yeah, Back in the U.S.S.R
(I'm Back Home)

Overall Message:
According to an interview from Radio Luxemburg in November of 1968, Paul McCartney who was mostly a Beatles song writer and one of 2 lead voices said, the song was written from the POV (point of view) of a Russian Spy returning home to the U.S.S.R after a mission inside of the United States and the relief of being back home from such a stressful job