It is like a HUGE world like example: the monster truck is massive.
Sentence example: The house is massive.
Somebody who is too inflated and thinks they are better than everybody.
Carl:Hey see Lisa over there?
Joe:Yeah,She is SO massive.
Carl:Yeah she keeps saying she gets all the meat...
Super cool. Awesome. An organisation that is kicking ass.
Big up the Birmingham Massive!
Massive is a term typically used only in Dublin (most commonly Tallaght) to describe something as being good or great.
Can also be used to say someone looks beautiful or stunning, however can get you into a lot of trouble if the recipiant doesn't understand the term.
Keep in mind that it's not something you'd say to describe somewhere or someone, but rather something (I.E., a artical of clothing, food, a night out.)
Instead you should say "They're the craic!" Rather than "They're massive." When referring to them alone.
Girlfriend: "Do you like me dress?"
Boyfriend: "Yeah, 's massive on yah."
- - -
"That food was massive."
"Ya' look proper massive"