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to behave in a submissive or overflattering way. It can also refer to being an excessive fan of something.

new gens heartbreak emoji

I once typed a definition for dickriding, which is a synonym for meatriding:
A contronym, since it both means excessively defending/honoring and hating on/attacking another user

Actually never heard of "meatride" being used for attacking someone.
When you ride someone's meat, they feel good.

You don't ride someone when you hate them, you ride them when they have something you want.