Partial translation, I could not translate the first panel.
For slurred okasan I'm using the word "Mahza", which is inspired in the Goldmember's Dutch accent pronunciation of "Father".
3) This shit is good!
Mun-ch Mun-ch
4) Happiness
Fuaah!
Fuaah!
5) From today this is our Yukkuri place.
Hooway!
Led'z dage id eajy here!
6) If we eat, we poop!
Remyu poopz too!!
Led'z poop eajy!!
7) And after poop, do clean-clean~
Undersdand easy!
Gwead!
8) Weimyu will poop
Yu~n Yu~n
9) Poop iz oud!
Do clean-clean