Funny Dirty Joke

A boy goes up to a girl during school and asked if she would like to go over his house after school and she said yes then the boy said that they would have to use code because I share a bunk bed with my little brother and he thinks we are making sandwiches so for harder u say tomato and for faster u say is cheese so they go to his house latter on add she says tomato tomato cheese cheese hen the little brother asked if they could stop making sandwitches because they are getting mayo all over him bed