"The van's really booking"

Solution 1:

book

Intransitive verb 3) slang : leave, go especially : to depart quickly,

"We booked out of there. "

-Merriam Webster

So the van was proceeding at high velocity down the street.

Although Etymonline has its origin as "unspecified" to 1977, I am sure I heard it going back to at least 2 years earlier in Philadelphia or Lakehurst.

Solution 2:

I've only ever heard this used once - in T2: Judgement Day. The young John Conner uses the term and it was sufficiently alien to me that I recall having to write to an American pen-friend at the time (I'm in the UK, and this was 1991 remember!) to find out what it meant.

Interestingly, my recollection of when JC says this differs from the online script sources I've looked at. The 'official' scene is given as in the vault at the Cyberdyne lab when John grabs the original T-800 arm and chip:

"We've got Skynet by the balls now, don't we? Let's book!"

But I'm sure in the actual movie John says this much earlier, when he's with his friend on their motorbikes and the new T-800 and deadly T-1000 haven't intercepted him yet. I'll have to fire-up the movie tonight to confirm.