That's a meme was a sentence made between a few Discord Dwellers / Team Speak Users years back.
The sentence "that's a meme" could literally define anything stupid, questionable, exciting or literally just ANYTHING.
1. Pixel: "Went skiing today, did a few cartwheels down the hill".
2. Qwoah: "That's a meme but did it hurt?".
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1. XP: "Had a girlfriend for two days, she left for her cousin."
2. Random: "For her cousin? Now that's a meme."