A person who is addicted to going to the mall, to either shop or just walk around.
Logan is a malloholic. He had nothing better to do with his day, so when she woke up at 9a.m. he went to the mall and walked around until 4. But bought, nothing, except lunch.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!