When a grown man, either due to shyness, flirtation, being tickled or for other reasons related to becoming giddy, fails to laugh like an adult male, 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.
by SPACIAL-D December 3, 2009
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