A definition created by a Swedefag which basically means that you get a boner. Mostly from a girl depending on your gender. You can for example have this wet dream or just a day dream about a girl when suddenly your stick gets filled with blood and ready to go.
"Hey did you see that girl?"
"Yeah, I got totally bonealized!"
"That girl is a real bonealizer!"
"Suddenly she bonealized me!"