A fit of uncontrollable laughter that may overcome a person who has been correctly accused of a small offense. The guilty giggles will reveal a persons guilt despite the fact that they are still trying to cover it up.
Dad got the guilty giggles when Nicole accused him of eating the last piece of ice cream cake.
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."