To leave, abandon, or purposefully lose someone. My little brother was being a real pest around me and my friends, so we decided to ditch him in the mall. I can't believe she ditched me to go hang out with her friends!
See also: ditch
1. tv. to dispose of someone or something; to abandon someone or something. The crooks ditched the car and continued on foot.
2. tv. & in. to skip or evade someone or something. Pete ditched class today.