Your First Dirty Japanese Word (くそ)

He says:
kuso　（くそ）=shit
You can say kuso!(くそ), kusso-（くっそー） too.
Basically kuso means poo, feces, but like English way, Japanese "kuso" is used in when we are angry, shout in an unexpected bad situation as well.

She says:
Kuso is the first dirty Japanese word anyone will teach you, so it's appropriately where we're starting. It's often used like "Shit!" or "Dammit!"--as some sort of exclamation. He claims that you can also use it to say something like "I've got to take a shit." but I've never heard him say it like that.
Interestingly, while "kuso" is often treated like it's a bad word, it's not quite as bad as people make it out to be. In certain situations, it's not at all inappropriate to hear young children saying it. My 2 year old students would occasionally say this word. How?

• hana-kuso (はなくそ)--booger (literally "nose-shit")
  
• me-kuso （めくそ）--eye booger (literally "eye-shit")
  
• mimi-kuso (みみくそ)--ear wax (literally "ear-shit")
  

These are all common words and it's the right way to say them. So it's not like a child would get in trouble for saying "kuso" in these situations, the way that an American child would get in trouble if they said "shit".

The next word will be...あほ。