In every direction or manner; a playful or archaic way of saying 'in all possible ways' or 'helter-skelter'.
A compound formed from 'ever' and 'which', blending Old English 'æfre' (always) with 'hwilc' (which one). The form is dialectal and largely obsolete, appearing in older regional speech.
The phrase 'everwhichway' became famous from a Forrest Gump scene, but it's actually rooted in 19th-century American dialect—people really did talk like this to mean 'all over the place'!
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