If Ringo Starr could get high with a little help from his friends, he could surely get pie with a little help from his friends.

What does "to get pie" in this context refer to?

Cheers,
Ekin

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The original lyrics are 'get by with a little help from my friends'. If your 'pie' is correct, it is a pun on the original lyrics, and applies to some information in the context you extracted it from. It is not an idiom in itself, to my knowledge.
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