He said he would show me the world...

[Dayvo]

We also called it a backy, the thing on the bike.

We called it a 'saddler' in Essex/the south!

But don't know what the answer is to the OP.

 

[Maz]

I thought 'backy' meant to carry someone on your back. A piggyback ride. N'est pas?

 

[Cycling Naturalist]

Whjen I was a young man I had fantasies about Mrs Scroggins, feet on my shoulders, me holding onto her stays...

And, obviously you still do.

 

[Paulus]

We had Mr Whippy ice cream vans down our way. We also used the term Backy to describe getting a lift on the back of someones bike. They sat on the saddle, and the rider used to stand up on the pedals and away you went.

 

[papercorn2000]

Round here, a "Mr.Whippy" was a "99".

 

[longers]

Round here a "99" is a Mr Whippy with a flake in it, and backies were just like Paulus describes.

 

[Joe24]

Getting a lift on someones like round here is called a "croggy."
a "99" is a mr whippy with a flake in it, and it does not cost 99p either.
Why is a 99 called a 99 if it is not 99p?

 

[longers]

Wiki has some possible answers to "the 99 question".

 

[Dave5N]

A Backy is sitting on the saddle, person pedalling in front.

A Crossie is sitting sideways on the top tube, person pedalling is behind.

 

[Fnaar]

Round here, a "Mr.Whippy" was a "69".

 

[Keith Oates]

I thought 'backy' was something you smoked..........................perhaps I've got the wrong word!!!!!!!!!!!!!!!!!!!!!!!!

 

[Haitch]

A Crossie is sitting sideways on the top tube, person pedalling is behind.

Until the person on the top tube loses balance, grabs the handlebars and sends the rider into the edge of an open car door needing 12 stitches.

 

[Maz]

Until the person on the top tube loses balance, grabs the handlebars and sends the rider into the edge of an open car door needing 12 stitches.

Yeah, but at least you got the day off school and could brag about the stitches the next morning.

 

[Baggy]

A Backy is sitting on the saddle, person pedalling in front.

That would by my definition of it as well...except there was time when I could give a backy without my legs failing 100 yards down the road -
probably because the cow-horn handlebars gave so much leverage

Poppets and whippy throw up some interesting search results on Google.