I use a term called bagger, to refer to a player who is trying to bag the pot with a weaker hand. A bagger may have two pair or a pair going up against your 3 of a kind or more, but shoves like he has a killer hand. I have no problem with that, because his hand has points.
My definition of a bluffer is a player who has absolutely nothing to play, and is just looking to steal the pot. I'm not a bluffer, and I don't too much care for them, especially those who are just at the table donk betting with junk hands.
That's why in the Movie Molly's game, where Bad Brad( as in a bad poker player) bluffed with actually nothing to win a huge pot from Hero -- who had a Queens Fullhouse, but folded because the possibility of Brad having a Kings Fullhouse was on the board -- Hero went berserk and had a meltdown. He got bluffed off a powerful hand by a bad poker player - who had never won a hand prior to that win. Hero was never the same after that. And that actually happened in real life.
However, if a player is low on blinds, and is trying to stay in the game, I can see the purpose of bluffing to try to get more chips to stay alive. But that's it.
The other day, a player was just donk betting and raising on every street with 47, while I was sitting on four of kind. I was like dude you had absolutely nothing, zero, total garbage, and you were raising like you were sitting on the nuts.