malaphor 

A mixed metaphor

After two martinis, Bill was spewing malaphors like "he'll do anything at the drop of a bucket" and "we missed our door of opportunity"

malaphor by Gerry Todd September 11, 2010

malaphor 

a mixing of two idioms, commonly resulting in an alternate meaning of the statements

Jim's favorite malaphor is "I'll burn that bridge when I come to it."

malaphor by Krose240 March 19, 2015