adj. Characterized by (or tending to provoke) vigorous, neckache-causing, possibly-rhythmic flailing of the noggin.
Related terms: headbang-ish, bouncy-headbang-ish, headbang-ish-worthy.
Real citation: "Overall, if you're okay with whiny, high-pitched voices, it's a very bouncy-headbangy song."
Made-up citation: "Gwar are not the most bouncy-headbangy band, but they make up for it with concerts that feature the most decapitations, steel brassieres, and body-fluid spurtings this side of Celine Dion."