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."
A quality orgasm that includes giggling to replace the customary screaming or moaning, which is pleasant and does not annoy the neighbors.
My GF is a ninja with sex; she's about to cum, so I brace for hurricane-force screams, but she pulls a gigglegasm instead. So cute when her boobs bounce along with it.
A one syllable laugh like "heh" or "hah" that in most cases is used when following a simple statement or comment that is somewhat humorous. Can also be used as a courtesy laugh.
Dude One: "Jebus man, my shoe is tied all funny."
Dude Two: "hah"
Dude One: "Thanks for the gigglet."
Dude Two: "Of course... heh."
To be struck with an incessant laughing/giggle fit that keeps going on and on at inconvenient times, rendering you fucked because now you look weird.
Person 1: *sitting in a classroom which is currently silent then happens to think of a funny line from Pineapple Express that strikes a chord* AhahahahahahahahaHAHAHAbuah! *clutching stomach, tears streaming down face, trying to be quiet but failing*