dating someone without constantly breaking up and getting back together. Not really used anymore. It's synoymous with "going out".
Tim and Andrea are going steady.
To date someone exclusively and see them on a regular basis. Kids first start "going steady" in middle school.
Exclusively dating a member of the opposite sex for an extended period of time.
Michelle and I have been going steady for about six months now.
deciding to start dating someone.
me and alicia are going steady
Regulary seeing each other in monogamy.
I didn't know you and Milli were going steady?
A phrase you're more likely to find in a 17th Century dictionary.
UrbanDictionary.com and I are going steady.