look up any word, like ratchet:
To outdo. To go one step further.

When engaged in a tit-for-tat exchange of practical jokes with a person, to soze is to do the one thing that the other person would not do.

From the name Keyser Soze, from the film "The Usual Suspects".
I drank some of his drink, but he soze'd me when he threw it in me face. Sweet.
by Philly T & Benny G October 08, 2003