It is a culmination of breast sweat that drips down to the belly button and mixes with the button lint then slides down to the crevices between the thighs and vagina and pools in the asshole then is absorbed into the underwear.
The beaver grease is so thick you could spread it onto toast.
by yuba gold June 30, 2012
the secretion from a womans vagina
" Honey, your underwear is covered in beaver grease."
by sufimomma November 28, 2009