Normally, when known-trash is touched as the focus of the clue, and the known-trash is on chop, it communicates a Trash Push.
However, what if the Trash Pushed card is trash? The other players can see that this clue must have some other purpose - it should signal an Discharge on the very next player.
This move is extremely similar to the Unknown Trash Discharge. In UTD, the focus of the clue is promised as trash. In the Trash Push Discharge, the Trash Pushed card is promised as trash.