jell

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nail Jell-O to the wall

and nail Jell-O to a cross and nail Jell-O to a tree
phr. to do something that is totally futile. (Jell-O is a protected trade name.) You’re wasting your time. Trying to get him to do that is like nailing Jell-O to the wall.
See also: nail, wall

nail Jell-O to a cross

verb
See also: cross, nail

nail Jell-O to a tree

verb
See also: nail, tree