I am drunk,
The leaves are falling.
* "Mellowly" in the translation is 'horohoro' in Japanese, which modifies both the drunkness and the way in which the leaves fall. Santoka used to say it's best to get drunk 'horohoro'. That is, not too much, but just mellow.
[via, Fire on the Mountain: The Selected Haiku of a Wandering Zen Montk Taneda Santoka]