Does anyone remember a movie/show with a big evil purple slime thing?

i think you are thinking about ''THE BLOB'' its an old movie from the late 50s or 60s and was remade in the 90s the original starred Steve McQueen try looking on the internet data base

The Blob

The only movie I remember seeing with a big purple slime thing was in a Power Rangers movie...

The Blob.

The Blob - a remake

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The Blob, there were two versions.

Maybe "Ghostbusters 2"

was it a goosebumps movie?

you sure it's not barney you're talking about? lol