Biker Lady

Biker Lady roars into Big Mouth for a scene or two, all leather and swagger, dispensing blunt, foul-mouthed wisdom to whichever kid has wandered into her path. She talks tough, rides hard, and treats hormonal teenage chaos as just another Tuesday.

Jenny Slate's gravelly, gleeful delivery turns a one-off gag into something genuinely funny — she commits fully to the biker bravado without ever winking at the audience, which is exactly what makes Big Mouth's background weirdos so quotable and rewatchable in the first place.