Wikisimpsons - The Simpsons Wiki
Mrs. Mom is a comedy film starring and "written" by Rainier Wolfcastle. The actual script was written by Marge Simpson.
When Homer Simpson wanted rich celebrities to stop thinking about themselves, Rainier set up a party. Marge approached him and asked if he would read her script for a film called Mrs. Mom, he said he didn't read scripts and he looked around in suspicion. Later, Homer and Marge were standing outside of the Aztec Theater and a seen a poster that said Mrs. Mom. Marge was sad, but said "at least it was made."
 Behind the Laughter
The film title is a pun of 1983 comedy-drama Mr. Mom.