Not actually sweat at all, caused by sports, sexual activity, regular wear & tear, or other wise. It is the pastey white substance found under the foreskin of a man, usually during warmer weather, or over heating for a period of time with out minimal bi-daily cleaning. Also fefered to as Fromunda Cheese, which is the delighful cheese that you get from-under your foreskin. Incomplete men with out the forskin are not capable of producing this substance, thus they do not have the musk or "mojo" that men with foreskins do have. The poor foreskinlees souls tend to be less satisfying in the sack, and get uglier women.
After my week long snowboarding trip up in Whistler, I was surprised when my wife licked the stinky smagma off my dick head when I got home...it was great, I love it.