The word cheek can mean several things.

The left and right cheek is commonly used to refer to the area of the face below the eyes and between the nose and the left or right ear. The word is also used to mean either of the two buttocks, also denoted with being either a left or right cheek. Cheek piercing is a rare form of body piercing.

Cheek is also a synonym for impertinence.

Further Reading

• Wiktionary: Cheek (http://en.wiktionary.org/wiki/Cheek)