What does brown mushroom mean?

brown mushroom meaning in Urban Dictionary

After a prolonged bout of anal sex, the giving celebration turns the recieving party around and proceeds to thwack all of them regarding forehead with regards to penis/dildo making a brown mushroom with its stead. Also called the brown mushroom going, because one will not want to hang in there after giving a brown mushroom.notes: brown mushroom is just theoretical, poo will not actually stick to your penis in quantities that could get this to work possible.