Throw Up
Spit, Vomit
If your mouth has dirt in it, you're going to throw up. That's just a fact.
と
は, つ
None
When you throw up it sounds like you're shouting, "Hah (は)!" Then all the dirt-puke comes out in a wave. It's less of a laugh "hah" and more of an oh no I'm throwing up "hah."