Polyspermy 

Before you revert the stable version - please discuss this first on the talk page. As for your question:
Look at the beginning of the third line. The Talmud quotes the verse from 1 Samuel 17, 4, which goes as follows: "And there went out a champion out of the camp of the Philistines", right? Now, look at your Bible - ibid., and see the full verse: "And there went out a champion out of the camp of the Philistines, named Goliath...". Right?
So, the Talmud quotes the verse about Goliath, and then: interprates this verse - using a pun - in the following way (see the Talmud ibid. in that third line): "One hundred foreskins of Philistines - got her [i.e. his mother] pregnant". In other words: the Talmud explains, that the biblical words "And there went out a champion" - mean:  "And there was created/born a champion", and it also explains that the biblical words: "out of the camp of the Philistines", mean: "out of a hundred foreskins of Philistines". Note that this fantastic interpretaion made by the Talmud - is based on a pun: the word for "camp" is similar to (i.e. sounds like) "a hundred foreskins" (not in English of course). Note also that fantastic interpretaions for the Bible - are very common in the Talmud.
Now, look ibid. at the next line (i.e. the fourth line); The Talmud now explains how - having so many fathers - is really possible from a biological point of view, so the Talmud continues: "Rav Matania said: no controversy over that; as long as the sperm [of the first man] hasn't gotten rotten [in the woman's body] yet, a woman can get pregnant by two men - all at once".
Notice that all of the Talmud's commentators explain all of this - as I did.
Hope this helps. Anyway, next time, please consult pefore you revert the stable version.