Recently heard in a viral song, whose lyrics are "sticking out your gyat for the Rizzler, you're so skibidi, you're so fanum tax", Rizzler is derived from "
Rizz", a shortening of "charisma" that takes the "
rizz" sound in the "ris" of "charisma". "
Rizz" more specifically is geared towards "pulling", the
act of gaining female/male/other partners in excess. Therefore Rizzler, or more appropriately a Rizzler, is someone who has an abundance of "rizz", and often "pulls".
(This example is a work of fiction. Any references to
people, places, etc is purely accidental.)
Dave: "Yoooo checkout Jake, he has like
eight chicks around him!"
Jake: "I'M A RIZZLER, MAN!"