talk out (the side of) one’s neck
v. phr.— «Only the sum of all these experiences would be able to make up Universe itself. of course i’m just “talking out of my neck” as we say in Dutch.» —“Synergetics—jitterbug, scale” by Gerald de Jong Usenet: bit.listserv.geodesic Dec. 3, 1994. (source: Double-Tongued Dictionary)
Further reading
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...
The word pickle is related to a similar-sounding Dutch word, pekel, meaning “brine.” In the 1400s, a pickle was a spicy sauce. Soon the word came to refer to the salty or acidic used to preserve foods, and later to the foods themselves...