Can’t tell his ass from a hole in the ground.
More Indian Proverbs:
In the end, all foxes meet at the furrier's.Indian
It is little use to dig a well after the house has caught fire.
Indian
When I drown, the whole world drowns.
Indian
Great anger is more destructive than the sword
Indian
The heart at rest sees a feast in everything.
Indian
The sieve says to the needle, "You have a hole in your tail."
Indian