This is when you twist a small bubble on the oustide of a balloon, normally a round balloon to use as an anchor point for attaching another balloon too. You could also use a piece of scrap balloon to tie the bubble up so that it will not pop out & unfold.
If you were to use this technique on a modelling balloon it would be called a side wall bubble.

hello graham.
here i wil add a comment
the drawing is nice BUT it looks hard to me to get the piech of scrap this way
the hand shout be at the low end of the balloon dont you agrea?

I have seen this picture lots of times now,
didn't noticed what was wrong, I even had to look back to see what you ment Simon .
But you are right, the balloon's are drown upside down

Petra

Sorry but you've lost me here, not sure what you mean?

Whoops, mistake.
It can just been done like on the picture. It's an art twist, not a raisin twist. When you use a raisin you must grab it from the bottum side, because the raisin is on the bottum. But you can make a bubble at the top side.
I think Simon was confused by the word scrap, he thought it was ment to be in the balloon, but your scap was for the outside to secure the bubble.
Sorry for reading wrong the first time Graham.

Petra

I read it wrong, differend technic.
I found out that I have this fully automatic translate guy a nice thing to have
I never used this one and then ty it of with scrape, I have used the sidewall bubble (for a nose) but then I use eyes to sercure, or a mustas things like that.