Best definition
the unpleasant bathroom experience endured by Whataburger customers after eating the Triple Meat Whataburger; this experience is purely due to

the sheer volume of the meal, and not at all to do with any lack of quality on its brand’s part

Huey: Man, I had Whataburger this afternoon, and–

Marv: Let me guess: you’ve been having Whatadisaster all evening…?