Definition 1: how wet your sisters pussy gets when she looks at you.
Definition 2: The sweat that forms on your balls while your fucking the shit out of your sister.
Usage Example: While I was fucking my sister on her eighteenth birthday, I felt "relative humidity" dripping from my nutsack. I made sis lick it off before I tagged her ass again.
relative humidity
Definition 1: how wet your sisters pussy gets when she looks at you.
Usage Example: While I was fucking my sister on her eighteenth birthday, I felt "relative humidity" dripping from my nutsack. I made sis lick it off before I tagged her ass again.
