We have called a preflop raise but are out of position to the raiser. Conventional advice is to check to the raiser and let him continuation bet with his entire range. If instead we bet into the raiser, we are making a "donk bet." It sounds like a derogatory term, and it's meant to be. They don't call it a donk bet for nothing — donkeys do it all the time
The idea is that we will make more money by checking to the raiser (even when we hit the flop), since he will usually c-bet (even when he misses).