Didn't see the episode, but the lyrics sound similar to a Judy Garland song called, "Just You, Just Me" Maybe you are hearing "messing up a lot" as "tie a lover's knot"
lyrics:
JUST YOU, JUST ME
Just you, just me
Let's find a cozy spot to cuddle and coo
Just us, just we
I've missed an awful lot, my trouble is too
Oh gee, what are your charms for?
What are my arms for?
Use your imagination
Just you, just me
I'll tie a lover's knot 'round wonderful you
Just you and just me
Just us and just we
Oh gee, what are your charms for?
What are my arms for?
Use your imagination
Just you, just me
I'll tie a lover's knot
I'll tie a lover's knot 'round wonderful you