Someone who cannot stop laughing and/or giggling. Usually a result from smoking mary-jane, but can also result from constant jokes and/or awkward moments. Most common in small groups and/or post-dates.
Dude: "Hey Girl"
Chick: "Sup. hahaha."
Dude: "Ok.. you alright?"
Chick: "hahah. Fine. wee.. hahaha. wow. hahaha."
Dude: "Haha damn girl.. you are like.."
Chick: "What? hahah. what huh? haha."
Dude: "A gigglesaurous."
Chick: "hahahahahahahha."
The lower portion of the malenutsack which typcially is judged by where the nuts are presiding. Depending on the mood one's "Gigglesac" region is usually the area of the bag containing the nuts. This portion can be stimulated by even the smallest of accents causing a slight giggle.