Waluigi wiggler was the best build setup, or at least most popular meta combo from before DLC wave 4. Buffs to other characters have brought them up to waluigi's stats, and now nobody uses this combo. so we can leave this unholy monstrosity in the past, and move on!
How to get Better at Mario Kart: https://www.youtube.com/watch?v=KADBlsfmIjQ
Combo: waluigi / wild wiggler / roller or azure roller tires / cloud glider or paper glider