Haha, high five to your wife. Part of the challenge and fun of being a sesquipedalian is finding the perfect opportunity to casually drop that six syllable word that you have been sitting on for years.
There is this fabulous term in Dutch for railway tracks that have deformed by thermal stress (endangering the trains) that basically begs to be used metaphorically. As of yet I have not found myself in a conversation that requires its use. I am afraid it is one of those once in a lifetime words.
I kissed her and told her "One of the things I love about you is your casual ability to use words like 'perambulate' in sentences."
She's a peripatetic with speech tending toward the sesquipedalian.