Getting Mantoned

When someone invites lots of people to an event then doesn't turn up.

Chris (in a group chat) hey guys let's meet up on Sunday for a ride.
Ben: yeah sweet, see you there
Jez: I'm in.
Jane: sounds great!

Sunday morning, Ben, Jez and Jane ready to go.

Ben: hey, is Chris coming?
Jez: nah, we're getting mantoned.