Normally, when known-trash cards are clued, it is a Trash Chop Move.
Otherwise, when players can see that the clue cannot be a Trash Chop Move, they should instead interpret the clue as a Trash Double Ignition.
Rarely, players can see that a clue cannot be a Trash Chop Move or a Trash Double Ignition. In this situation, it should instead be interpreted as a Trash Pull, which is explained below.
A Trash Pull is similar to a 5 Pull in that it "pulls" the card to the right of the card that was clued. This is a useful tool to have because sometimes, towards the end of the game, there can be a playable card in the middle of someone's hand that is not cluable directly due to the presence of other blocking cards.
Remember that a Trash Pull can only be performed if there is no other explanation for the clue.
In the End-Game, it is common for players to perform Burn clues for stalling purposes. Players have to be extra careful not confuse a Burn clue with a Trash Pull. This is especially true if there was nothing else obvious for the clue giver to do!
Trash Pulls should typically be used as a last-resort since they might be misinterpreted.
Trash Pulls and Trash Double Ignition are initiated in nearly the exact same way, so this can be confusing.
Trash Pulls take precedence over Trash Double Ignition. This means that if everyone can see that the Trash Pull was necessary to "get" a blocking card, then no-one else on the team is promised to have a playable card. (This follows from Occam's Razor.)