![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDfxHkkDMOTAMW8-sxfyaZiWh1d5tFWPR6gWVENCTixbc7bwKlbOJzaz_2MpBa7omLY004wVWEfzo7-Df2OsBPspRaXHWrif-TknLFFVp_r47i8ZfR_HF_pJGOU6B-p-OmyD3cXzEYKt9G/s200/A-Cup-Of-Coffee.jpg)
Literally, the phrase means "don't be unclear, be clear", but the use of relatively uncommon words causes confusion, making the phrase an example of irony, and more precisely a heterological or hypocritical phrase (it does not embody its own advice).