(US, slang, rare) To do something that is impossible or very difficult, with connotations of pointlessness.
They are asking us to nail Jell-O to a tree if they insist on having everything done in three days.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.