Nizz, also known as negative rizz, is a word used to describe someone with no abilities to pull.
Hubert : Yo dude, did you get a girlfriend yet ?
Robert : No, I have way too much nizz
Hubert : Imagine having no rizz, you have to be fatherless or something
Based from the word nizz, nizzler is a word to describe someone with no ability to pull. It's also the complete opposite of a rizzler. Sadly, anyone who's a nizzler will never be able to get any game.
Robert : Why are you lacking so much rizz ?
Hubert : I think I might be a nizzler
Robert : L bozo