Where can I figure out what exactly internet lingo means or what memes are?

I do not use the wider internet nearly enough to pick up on stuff and its starting to actually hirt my comprehension when I do venture out. Like wtf does "circlejerk" actually mean? I get the idea that its a satirical (maybe? Idfk at this point) thing but I have no clue after that. And what the hell is "lost" and why do people constantly yell out "Is that lost?!" for certain memes with no connection to each other? I don't have the time nor patience to learn these new and evolving things through immersion so where would I be able to figure what this stuff is and means? Sometimes I've been able to find out through google searches but a lot of other times I've either not known what to search or didnt get a satisfactory answer.