Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

This comic features two women lying on the grass looking at clouds. One asks what the other sees. Her companion dismisses the activity as stupid, declaring that clouds are just random moisture blobs and that any shapes people claim to see are merely reflections of what is on the observer's mind -- a reference to the psychological concept of pareidolia or projection, similar to Rorschach inkblot tests.

The first woman then looks up at the sky, sees nothing but ordinary clouds, and delivers the punchline: "I see a bitch." The joke works on two levels. On the surface, she is claiming to see the shape of a mean person in the clouds. But the real meaning, given her companion's own stated principle that cloud shapes reflect what is on the observer's mind, is that she is simply looking at her rude friend and calling her a bitch -- using the friend's own logic against her.