Two big corrections to make here...
Hodl: is simply a misspelling of “Hold”
"HODL" actually does stand for something today, it stands for "hold on for dear life" and refers to the mentality that die hard bitcoin enthusiasts have to stay invested even during the darkest days. The origination is due to a misspelling of "hold" but the person was using the word in the context of not being able to predict the market and admitting to having a fuck all attitude, he was going down with the ship!
This is a significant bitcoin reference and anyone getting it wrong should not be declaring themselves as some sort of authority over bitcoin related terms. (This is especially true for someone who registered on this forum in 2014).
Bagholder: people who purchase a currency at an ATH or during a bull run
Bagholder in no way means what is stated above. A bagholder is someone who owns worthless stock. So in the crytpocurrency world a bagholder is someone who bought into a shit alternative cryptocurrency (based on hype or who knows what logic) and still owns these worthless tokens. Anyone who owns Bitcoin Gold is essentially a bagholder.