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4.
majorly is what you get when you mumble and slur "major league". So, I am "major league" annoyed = I am "majorly" annoyed.
"He was majorly upset."
by david June 28, 2004
 
1.
(adverb) very, very, very
That movie was majorly stupid.
by Anonymous January 14, 2003
 
2.
tremendously, more than you expected, allot.
"I hoped you get paid majorly"
by Nzinga K October 09, 2006
 
3.
1. adj. Very much, or intensly so

2. A LEGIT WORD (NOT SLANG, as opposed to legit), THOUGH A REAL DICTIONARY WOULD LIKE TO DISAGREE
1. Wow. That concert last night was majorly cool. I loved the pyro!

2. Avery: "I just found out that majorly isn't a real word"

Taylor: "WHAT"

Avery: "I KNOW. IT'S 'SLANG'. WHAT THE HELL"
by screw you, webster July 18, 2009