We are off the walls!

A couple was very excited about good news they received and posted that they were “off the walls”. Given the context, I believe that this is a mashup of “bouncing off the walls” (nervous excitement) and “off the charts” (a lot better than expected). “Off the rails” (crazy, mentally unhinged) could also be in the mix as they may have been crazy with excitement? Kudos to Buzz McClain for spotting this one and sending it in.