"NGAHHH!!" is the 45th track in the Undertale Soundtrack. It plays before fighting Undyne in the Neutral Route (if Papyrus is alive) and receiving "cooking lessons" from her. A sped up version is played when befriending Undyne. Additionally, another, even more sped up version (2x faster) is played when Undyne panics about whether or not anime is real at the end of Alphys's date.
It is a shorter, slightly modified version of "Spear of Justice."