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1.
1) Someone who is crazy; wild; always pushes things one step too far. Someone whose actions are hilarious in a dark farm way.
2) An action that is totally out-of-control weird and crazy.
1) Person #1: "She's really crazy."
Person #2: "Like, crazy crazy? Or weird crazy?"
Person #1: "Both. She's totally wazzo."

2) Person #1: "After I take a dump I'm gonna need to go streaking."
Person #2: "Dude, you are so wazzo."
by Soleil22 February 06, 2010
 
2.
U.K. Large delicious breasts
See that girl over there with the wazzo jugs
by Don Swift February 20, 2004
 
3.
To do ones mum and dad at the same time>
The little boy could not get to sleep so he went to his mum and dads room to have a wazzo.
by Jeremy Kyle sucks fad May 03, 2009