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To respond to a piece of good news with animated, speechless, exuberant excitement. Named after musician Mike Mangini, who was rather pleased to be selected as Dream Theater's new drummer.
"When Edna found out she was going to be a mother, she manginied so hard and for so long that she almost gave herself a hernia.
mangini by bobcatterington June 21, 2011
To bother or annoy someone or something
"Man these exams have been magging on me all day!"

Mike Mangini 

One of the greatest and fastest drummers to ever be born, and the current drummer for Dream Theater. Considered to be the inverse of John Petrucci, due to his ability to rupture space and time by playing over a billion notes per second. Like Petrucci, he has limited himself to 2000 notes per second which only causes severe head pains whereas anything more than 2500 notes per second causes the human head to explode, due to the overload of greatness. This being the reason he decided to leave Berklee, because of the student's heads exploding because they thought they were worthy of God. He is also considered one of the best wearers of the heavy metal soul patch, much to the disdain of Jordan Rudess.
Iran better chill, or We'll send in Mike Mangini.
Mike Mangini by Riggs1995 November 27, 2013

pull a mangini 

Eric Mangini is the current Cleveland Brown's coach and he once said that "He was going to take the Browns to the Super Bowl." While this is never going to happen it has become a popular euphemism for dropping a duece. It also provides a nice cover when talking around girls as they do not typically know who eric mangini is.
Guy 1: Bro i got to pull a mangini if you know what i mean.

Guy 2: Ya i got ya

Girl 1: What does that mean?

Guy 1: shhhh, go make me a sandwhich.
something that bothers or annoys someone else. To frustrate someone
"That teacher has been magging on me all year long."
Magging by HustlingErday December 21, 2009

full maggin 

During the act of sexual intercourse the man will go ball deep and insert his two testicles up the womans anus. It is said to bring a strange pleasure, especially when the testicles are removed and the famous "clack, clack" sound is heard.
1)"Oh mate was full maggin a girl last night and my bollocks have never been more supple"

2)Ollie: "Hey i shagged that girl last night"
George: "Wow did you full mag her"
Ollie: "Naturally"
full maggin by dcv November 14, 2007