The Basic Formula
The German language has many colorful ways of expressing that one has reached the point of near-collapse from exhaustion. To make sentences expressing this, just fill in the blanks!
Ich bin komplett/total/völlig/absolut (Adjektiv).
I am completely/totally/entirely/absolutely (adjective).
am Ende at the end
im Eimer in the bucket
k.o. knocked out
fix und fertig finished
hundemüde dog tired
totmüde dead tired
ausgepumpt pumped out
Put it Together
Ich bin komplett hundemüde. I am completely dog tired.
Ich bin absolut alle. I am absolutely empty.
Ich bin total fix und fertig. I am totally finished.
Give it a try!
In less extreme cases (or if you're just too exhausted to think of something more compelling), the word müde (tired) will usually do just fine!
Ich bin müde. I am tired.
Now go get some rest.