English Translation
O-oi!? Don’t rip off my precious hair!
Do you have any details about this interjection, ぐはっ？
ぐはっ！is onomatopoeia. It sounds like someone giving you a sharp body blow. It really hurts and you may hunch down. Or you may throw up blood bleeding from your intestines.
ぐはっ is not used by female speakers. Never. Please also note that ぐはっ sounds like a bit wacky nerdy anime-ish expression.