Itasha

痛車 – a car painted with cartoon/anime characters (lit: “painful car” because it is painful to look at)

Hakadoru

捗る – to make progress (i.e. with schoolwork, etc.) 研究論文は捗ってますか? How is your research paper coming along?  

Kageguchi

Yin/Yang
陰口 – gossip; talking about someone behind their back 陰 – shade; shadow; secret; yin 口 ...

Kenkon Itteki

乾坤一擲 – to play for all or nothing; throwing all into a task; to stake everything (on something)...