Because while that is technically the correct spelling for each word, but as a phrase it doesn't seem to work well together. It lacks symmetry (Hippie vs. Dippy) and uses the extremely rare-yet-proper Italian "bologna".
Origin: The phrase is used with delightful comic effect in The Lego Movie and quoted on wikiquote as "hippie, dippy baloney".
Consider:
- "Hippie-dippie" for symmetry? Merriam-Webster supports it. (Wiktionary includes it as a short entry).
- Hippy? Would match "Dippy". Although "Hippie" has the most support in usage and prescription (on wiktionary and English stackexchange)
- And yet Google suggests "Hippy Dippy Baloney Lego" for a "Hippie Dippy Baloney Lego" search, as if "Hippie" were misspelled based on the comparative number of search results.
- Dippie? Would match "Hippie".
- And yet scarce presence among Internet dictionaries.
- Whereas Dippy
- Baloney? Far more common in usage and growing in dictionary acceptance.
- Dash between hippie and dippy? Dash between all three?
The question is: How best to spell "Hippie-Dippie Baloney"?