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1.
a sweet natured girl, with high ambition. She shines with love and joy. Always a loyal friend, and strong leader.
She was truely an adison, and led her team to victory.
by Olive You Photography February 03, 2010
 
2.
A pairing that involves Adam Lambert and Allison Iraheta from American Idol Season 8. Everyone who supports Adison agree that these two have great chemistry and look amazing together. Most fans have even come to hope that they end up romantically together in the future.
Person A: Oh, my god! Did you watch Adam and Allison in Slow Ride and the finale? They look so good together!

Person B: I know, right? I am such a huge Adison fan too!
by dee_nasir May 30, 2009
 
3.
A pair of giant tits with nipples pointing in different directions.
guy: "show me your boobs"
girl: "okay!"
guy: "whoa! Put those adison's away!"
by Megastar887 December 18, 2010
 
4.
faggot that every one hates!!!
look at John Baily he is such an adison!
by Alden Henson January 30, 2008