This is the kind of russian prison folklore. In russian prisons are the sort pariahas between the others - the "roosters". They are whores, mansluts, humaliated people. Remember - rooster is not a man. There are some ways to become rooster - doing something bad to the "bratva", work on administration or touch or speak to the roosters. So, fir this riddle, if you, instead your mom take the stool whith cocks, you would be "zashkvared", other meaning - humaliated and becomes a manslut. If you choose the stool whith cocks for your mom, you would be roostered too because you&#39;ve betrayed the saintest thing for any russian prisoner.
So, zakroy yebalo, motherfucker, and choose your stool.