1)In expressing disatisfaction over a situaion:
Derrrrrrrrrrrrrrrrrrrrrr, my
dad drank all my Jack Daniels.
2)A response to a weak joke:
Haha,
like your mom!
Derrrrrrrrrrrrrrrrrrrrrr.
3) To emphasize somone's or one's own retarded actions:
Derrrrrrrrrrrrrrrrrrrrrr, what were you thinking?
Derrrrrrrrrrrrrrrrrrrrrr, what was I thinking?