“咯咯笑”的英语可以翻译为：chortle，giggle ...

这实在很离奇，我忍不住咯咯笑了起来。It was so unreal that I broke into a fit of giggles.接着，她莫名其妙地咯咯笑了起来。And then, unaccountably, she giggled.他咯咯笑了笑。He gave a chortle....