This is the 2203rd most frequent Chinese word.
槽
"槽" means "groove," "trough," or "slot."
In this sentence, '槽' refers to a 'groove' or 'slot' where parts are placed.
这个机器的零件放在一个槽中。
The parts of this machine are placed in a groove.
Here, '槽' is part of the expression '吐槽', meaning 'to complain' or 'give criticism humorously'.
他对那部电影能够吐槽一整天。
He can complain about that movie all day.
In this context, '槽' signifies a 'trough' used for holding water.