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1.
A person that you are "going steady" with. It is used for a mutually exclusive and monogamous relationship without the dreaded "boyfriend" or "girlfriend" title.
"I don't want the shitty connotations of the term girlfriend, but you can be my steady buddy!"

"Have you seen John? Hes been hanging out with his steady buddy an awful lot lately."
by ooberhack3r June 07, 2009