* It's a misspelling: There might be a similar word in Luhya that sounds like "Senjee" but is spelled differently. Could you provide more context or the full phrase where you encountered this word?
* It's a word from a different language: It's possible "Senjee" is a word from another language, perhaps a neighboring tribe or even a foreign language.
* It's a made-up word: It's possible "Senjee" is not a real word at all, but rather a made-up word for a specific purpose.
To help you get the meaning, please provide more details about where you encountered the word and what context it was used in.