Panty Fighter

In anime and manga (and some video games), a Panty Fighter is a sub-genre of Magical Girl that primarily focuses on adolescent and/or young adult females engaging in various forms of combat (either with or without magic involved), with frustrating dialogue, clothing damage, partial nudity, and panty shots all being emphasized—basically Mahou-Shoujo for Men.

Examples include Ikkitousen, Sekirei, Queen's Blade, Freezing, Cross Ange, and even Kill la Kill.

Weeb #1: I just watched an episode of an anime where two bitchy girls fought each other for twenty minutes, and I don't even know what genre that's supposed to be.
Weeb #2: Good sir, you just watched a Panty Fighter.