1) A condition in which the genitalia of a man or woman is foul or rotting away.
2) A sexually transmitted disease.
I fooled around without a condom and acquired a bad case of crotchrot.
1) To strike an object with another object, i.e. to hit a baseball with a baseball bat.
2) To make a goal in a sporting event.
1) C'Mon man, nail that ball out of here!
2) I tried to nail a shot from halfcourt but it missed the goal altogether and struck my five-year-old brother between the eyes.