1. This was used by Stevie T, one of my favorite YouTubers. In Music, to tip over the brown cow means to storm in with a powerful Wall of sound after a really delicate part.

2. As Stevie T describes it, it means to add power to an otherwise weak riff.
A Friend: This is surprisingly light for Iron Maiden
Me: They’ll tip over the brown cow soon!
by Man Of Few Words April 18, 2021
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