How can people burp up a BM

i have read 3 times on this board of questions that some people have been burping up BM's or vomiting up BM's this leaves me very confused how does it happen and how can the BM make it all the way up??? can someone please explain..can this happen to anyone of us or are this people pipes messed up from surgery????

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.

You must be logged in to post an answer. Click here to log in.