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.
An engagement ring worn by a man. Often worn by men in a relationship with a more progressive partner. Usually applies to heterosexual couples. Man + Engagement Ring= Mangagement ring
Dude A: What is that ring all about, I didn't think you were married?
Dude B: We just got engaged, but she wanted me to wear a ring as well Dude A: Wow, she has you wearing a mangagement ring