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A plastic cup like vessel used for urination when access to a toilet is impossible.

Can be any cup, though there are cups sold specifically for this purpose.
Dave peed in his Big Gulp and threw it out the car window. He needed a go-cup badly and it sufficed.

Gimme a go-cup dude, Im about to explode.
go-cup by Immortal Yawn October 9, 2011
a cup used to hold any beverage that one may take with them while they are out and about/while they are on the go
"Mom gave her child a go-cup in case her child got thirsty in the car"

"We all had our go-cups when we went hiking the new trail"
go-cup by DazzDeLaMorte March 15, 2007

Go ahead cup 

When you cheap out at McDonald's and order a water with your double cheese burger and the cashier hands you a soda cup instead of the standard 6oz water cup.
Ken: Sweet I got the go ahead cup, now I can wash down the grease from the cheese burger with some coke.

Jeff: yo Ken, you are Ghetto Rich.
Go ahead cup by DB in MO October 21, 2008

Go get yourself a cup of coffee 

Metaphorical.

1) "This procedure we just took you through will now result in you waiting around for a bit, so rather than sitting around twiddling your thumbs watching the computer think, why not take a break away from your workstation instead?"

2) "This procedure or anecdote we are about to take you through will take a bit of time. Now is a good time to take care of whatever you feel is necessary before we proceed, because interrupting for one reason or another, emergencies barred, would be a not so good thing."

Comes mostly from technical documents, specifically where compiling is involved, as sometimes the process of compiling code takes a while.
"I'm going to be working on your computer for a while, James," Jerry said to the auditor as he frobbed some drivers. "Best go get yourself a cup of coffee

to go cups 

Using disposable paper coffee cup and lid to transport your beverage of choice...usually bl lime, white wine, extra spicy bloody marys or whisky/waters. A sneakier version of the flask, to go cups make daytime/public drinking okay...at the mall, on the bus, at work or on your way to da club, everyone just thinks its coffee! Invented by an ultra-trendy couple in Seattle's International District. It is advised to purchase cups and lids at Costco, as it is always smart to have plenty on hand.
Amy: Babe, we need to get on the road, your parents are waiting.

Kevin: Chill out babe, I am just getting our to go cups together.

OR

Kevin: Okay everyone, cabs here.

Amy: Everyone, grab your to go cups. I put your names on them.
to go cups by Bubba Linda October 19, 2010

go get a cupcake 

commit sexual actions against a minor and/or engage in pedophila
Bryant: "I was goin' to go get a cupcake, bro."
Edwin: "I'm going to tear out the ligaments of your arms and dangle them in front of you like strands of spaghetti."