The yellow fog that rubs its back upon the window-panes,
The yellow smoke that rubs its muzzle on the window-panes
Licked its tongue into the corners of the evening,

from T.S. Eliot – The Love Song Of J. Alfred Prufrock on Rap Genius

Meaning

Fog/kitten mixed metaphor going on here (Eliot is known for his kitten imagery; his poems inspired my mom’s favorite musical: Cats). Elliot creates a metaphor about cats without actually using the word “cat.”

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The yellow fog that rubs its back upon the window-panes, The yellow smoke that rubs its muzzle on the window-panes Licked its tongue into the corners of the evening,

The yellow fog that rubs its back upon the window-panes,
The yellow smoke that rubs its muzzle on the window-panes
Licked its tongue into the corners of the evening,