This is a swear word you use when people make fun of your disability, accident, family and kids... and people ask you to apologise for asking a simple question.
I will not apologize for speaking the truth. Ningaya!!!
It is a hybrid-kinyarwada word invented by RCA bwoys to mean the act of being in a great trouble that can even lead to loss of life as well as some body parts.
If he finds you during the same moment, he will widen you. (Arakwagura)