The reason you have brown stuff in your underwear is because you didn't clean yourself properly. Not wiping yourself can lead to an embarrassing stain on your underwear as a result of waste that was not cleaned up properly.
Poo
This could be the beginning of your first period.
Black underwear may appear to turn brown due to a variety of factors such as wear and tear, friction from washing or wearing, and exposure to heat and sunlight. Over time, the dye in the fabric can fade or change color, leading to the perception of the underwear turning brown.
how am i suppose to know I'm not perverted
It means you will start you period soon.
pink unicorns with yellow stripes.
its probably skiddies :D hope dis helps
You might be starting your period in a couple of days.
he throw away his underwear after one night
What it looks like on your underwear the first time you menstruate varies from female to female. Most females will experience light spotting, possibly a light pink or brown colored discharge on their underwear.
A yellow brownish stain in a girl's underwear means that she will be starting her period ina couple of days so be prepared so that you won't end up with a bloody mess in your underwear and maybe on your pants.