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1.
A low security transportation meathod in the United States which neglects serving several states.(Yes they pretend that Alaska, Haiwii, South Dakota and Wyoming do no exist). Amtrak opperated trains ranging in age about fourty years. This system is a bit slow for trains but extremly pleasn't to travel upon.
I took Amtrak from LA to New York, it only took six months (of course it was a month late, it is Amtrak).
-or-
Amtrak is the sex. We had a blast going to a two states over.
by Godly One July 07, 2005
 
2.
The united states passenger railroad in 47 out of 50 states.

Provides long and short distance travel for passengers.
I am going on Amtraks Coast Starlight next month.
by Anton February 19, 2005
 
3.
Basketball: A traveling violation

Travel: The government-owned corporation that operates the Acela from Boston to DC.
Basketball: The ballhandler raised his pivot foot, and put it back down without passing or shooting - the ref has to call Amtrak on that!

Travel: He's taking the Amtrak Acela Express from New Haven to Penn Station instead of Metro-North to save time.
by CP12 April 01, 2006
 
4.
A sexual practice whereby a group of male friends (or "homies") queue up and take turns fucking girls. This adds a systematic element to group sex, much like the Miller rotation system does in volleyball.
From 2 Live Crew's "We Want Some Pussy":

"You see, me and my homies like to play this game
We call it Amtrak but some call it the train
We all would line up in a single-file line
And take our turns at waxing girls' behinds
But every time it came to me, I was shit out of luck
Because I'd stick my dick in, and it would get stuck
The girls would say "Stop!" I'd say "I'm not!
That's enough, I quit, 'cause y'all are bustin' me out!"
I say, girls, don't hide it, just divide it
And please don't knock it until you've tried it
So to all of you bitches and all you hoes
Let's have group sex and do the Rambo!"
by sc0ner June 12, 2010
 
5.
from amtrak old moto We always pull out on time.... the act of pulling out berfore u come inside a girl's pussy
I was fucking this girl but i had to amtrak it because i wasnt wearing a condom.
by lax guy 4114 November 13, 2007
 
6.
verb. To have sex without a condom.

derived from: America's national passenger rail system. It's a lot of fun to ride, but it's really dangerous. It always seems like a train is derailing or crashing.
Girlfriend: I'm ready, put it in!

Guy: But I don't have protection, maybe we shouldn't...

Girlfriend: It's OK, just AMTRAK me!
by amtracker April 24, 2010
 
7.
when a person is out of control, a complete train wreck
He was an amtrak last night
by Sally free-bird August 17, 2007