Smegma; a white, cheesy sebacceous secretion from under the foreskin. This tends to be very foul smelling stuff. It can also accumulate under the skin covering the clitoris. Be sure to bathe every day so when your lover goes down on you they do not shudder in horror at the rank stankiness on their tongue. Usually fromunder cheese on males only occur in the uncircumcised. But don't cut it, just wash it!
As Mary went to go down on John, she noticed clumps of Fromundercheese under his foreskin. Subsequently Mary never gave head to John again.