In Britain If You Are "Queued Up," What Are You Doing?

In Britain, to be queued up means to be in a line waiting for something.  To be 'queued up' is a colloquialism and is something that some people would say, but it is nothing something that one would write, it is not good written English.

To use it in a sentence, one might say:

I was queued up waiting for my turn at the checkout when I spied Glenda and left the queue.

Although it is poor English, like many colloquialisms, it is commonly used.

Cued up is also a phrase in the English language, this has similar meaning, but it often refers to using equipment to set up a set of pieces of music or video footage, they have been cued up, ready to be played.  

The Queue is known as the Line in the U.S.A, one waits in a line, in the UK, one waits in a queue.