This word is pretty much what it looks like. The opposite of excellent, it's used for dramatic effect and subtlety. It fools the listener into thinking that her last comment was appreciated and approved of before, a t the last second, it is shockingly shot down. It is pronounced Ek-sell-NOT, with the final syllable having the accent. Example: Well Jeremy, it looks like you'll get to work a couple of extra hours tonight! That is excelNOT.
EXCELNOT
Meaning of EXCELNOT in English
Slang English vocab. Английский сленговый словарь. 2012