When a grown man, either due to shyness, flirtation, being tickled or for other reasons related to becoming giddy, fails to laugh like an adultmale, and instead can only muster a series of giggles containing effeminate qualities.
Michael broke into an embarrassing bout of mangiggles after being asked on a date by an attractive woman he had long desired.
OR
Joe exhibited a case of mangiggles while being tickled by his long-time girlfriend. She now "wears the pants" in the relationship.
A rare creature that is found in the woods of downeast Maine. It's sole purpose in life is to mate. It's glasses use thermal energy to identify females to try and seduce for the purpose of mating. Through years of evolution it is developed pasty white skin due to it no longer needing to go outside. While it's a simple creature, it's able to trick inferior creatures to hunt for it. It's diet primarily consists of Brandy and any food provided by its trickery. It's known for its unique trail of greasy residue it leaves anywhere it touches.
"I was outside drinking by the fire and I heardsomething it the woods, I think it might be a McGigglestein"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.