by mackmaster January 14, 2005
When a guy is fucking a girl, usually the little sister of his best friend. The girl is under 18 or is not ripe in womanhood yet, she is still in puberty. It's one of the most severe cases of mackin.
by mackmaster January 13, 2005
CF-ing is that act of one fucking his or her cousin. It's most abundant in white trash familys. If they have offspring they tend to have mulitple limbs or have a slow process of thought. These people are known as CF's.
by mackmaster January 14, 2005