Camel toe

Camel toe, or cameltoe, is slang for when the outline of a woman's labia majora is seen in tightly fitting clothes. The male equivalent of cameltoe is "mooseknuckle". It is called a "camel toe" because of how the woman's labia outline is similar to that of a camel's toe. 
Camel toe happens as a result of wearing tight-fitting clothes, such as shorts, leggings or swimwear.