Definitions by Soy Brownie

nightcap 

a male act of ejaculating in ones hand, followed by slapping the semen onto the top of the cranium, onto oneself or another.

After her boyfriend withdrew from her vagina in the doggy-style position, the woman's hair was soaking wet after being slapped with a nightcap from behind.

After masturbating into his hand, his hair glistened from a self inflicted nightcap.

nightcap by Soy Brownie October 25, 2006