('Brit') Going to the circus would be a bit of a 'giggle'. [=would be amusing or enjoyable]
I had an attack of the 'giggles'. [=I was unable to stop giggling]
She 'giggled' like a little kid.
(..) They can suck in whole galaxies. Black holes used to be science fiction. Now we know they're real. When I was a PhD student, People used to giggle when you'd hear about black holes. They're like unicorns, mythical creatures. We called this the "giggle factor." (..)2010 TvShow: How the Universe Works Title: Black Holes Season: 1 Episode 2