It means you are having relation in a non friendly way with a partener other then you spouse aka cheating
Dreamin' until your dreams come true
I'm Dreamin' was created in 1990.
Day Dreamin' was created in 1986.
Dreamin' of Love was created in 1988.
Dreamin' Out Loud was created on 1996-06-25.
Dreamin' Away was created on 2003-02-19.
Dreamin' in a Casket was created on 2007-11-12.
Day Dreamin' Davey happened in 1991.
California Dreamin' was created in 1965-11.
Day Dreamin' Davey was created in 1992-06.
California Dreamin'" by Scala & Kolacny Brothers