simulposted 

The process of two people writing, and particularly posting to a bulletin board at roughly the same time, each not knowing the other was doing so. It is off particular significance when similar points are being expressed in each post.

Yes, those tires' traction was awesome. Apparently we "simulposted!"

simulposted by ribick December 29, 2018

simulpost 

n. 1. Two or more contributors to a message board post so closely together in time that the messages receive the same timestamp.

You have to get up pretty early in the morning to stay ahead of a herd of simulposting Farkers.

simulpost by Pending April 30, 2003