ok, "Wax on - Wax off" in Japanese..
just the sound;
ワックス・オン、ワックス・オフ
in the movie Karate Kid;
ワック スかける、ワックスとる
"Mad Hippo" in Japanese
there are some words for MAD in Japanese,
気違い   (similar to insane)
狂った   (...rabid)
狂気の   (...frantic)
怒れる   (...furious)
HIPPO is
カバ (katakana)
河馬 (kanji)
so combine them, like
狂ったカバ
狂気の河馬

hope these answers can satisfy you Nefelim!  
BTW these people here who tried to help him/her out are so nice and good to see it
