There is no single terpene that is guaranteed to make you "giggly". Limonene and terpinolene are often connected with a light and uplifting feeling, and can provide giggle-inducing effects for some users. What you experienced is mainly dependent upon four main factors: setting, THC levels, mood, and amount of THC taken. Too much THC can cause an individual to experience anxiety vs. laughter as a response.
