A fork of Rural Dictionary
Delulu is short for delusional. Commonly used when someone is extremely blind to signs of their crush not liking them. It is also used a lot to describe a person who is in love with an idol/celebrity.
Someone whose delulu has self esteem so low that they think that nobody will ever love them, but they're so delusional (delulu) that they think everybody is in love with them.
"Mary is so delulu! Jake looked at her in the halls and now she has heart eyes for him!" *eye roll*