When you make plans with someone to do something but then after you made the plans you cancel them and do something else with a different person. Some people think ditching is when you invite someone somewhere and they can't come but it's not.
1) when someone leaves a group/party to go to another party or group of people
2)When someone says no to 1 person but yes to another person to a party or hanging out on the same day
3) forgetting about something purposefully
evil Maria is always Ditching the sweetinocent Andreas on facebook chat and comes back after he texts her and she pretends she was only gone for a minute because she felt bad for him !! :( :(