Former Watergate prosecutor Nick Akerman on MSNBC (Ari Melber’s show) uttered this gem, talking about Rudy Giuliani and the Ukrainians working for Trump.  It’s a mashup of “big kahuna” and “top dog”, both referring to a person in charge.  You can hear this one about 3 minutes into the video.  Link is:

This mixed idiom is similar to a similar malaphor posted a few years ago –  “head kahuna”, mixing once again “big kahuna” and this time “head honcho.  https://malaphors.com/2013/09/11/hes-the-head-kahuna/

A big thank you to Frank King for hearing this one and passing it on.  He’s the top kahuna of malaphors! @nickakerman