1: The act of a mother punishing her children/children's friends. Often used to describe a tongue-lashing.
2: When a friend acts like a typical mother, perhaps by nagging. Often used with "You sound like my mother!".
Derived from a misspelling of the word "memorize".
1: Dude, you better be a bit nicer to your mom, you don't want her to momerize you.
2: Dude, you gotta stop momerizing me! You sound like my mother!