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Lizzo 's Instagram name is apt ... because "Lizzobeeating" ate up all the haters online -- viciously tearing into people who are still making jokes about her appearance.

The singer-songwriter took to Instagram Thursday to vent her frustrations ... explaining she saw a fat joke about her go viral recently -- and, she wants to remind her fans not to let anyone shame them about what they choose to do with their bodies.

Lizzo writes, "Because when you’re big they talk sh*t, when you’re small they talk sh*t. Your body will never be good enough for them because it’s not FOR them. It’s for you. If I get a BBL mind ur business , if lose 100lbs mind ur business, if I gain every pound back and then some… mind ur f***ing business."

She then added a final dig, flaunting the only thing fat

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