nail Jell-O to a tree

== English == === Alternative forms === nail Jell-O to a wall, nail jelly to a tree, nail jelly to a wall === Pronunciation === === Verb === nail Jell-O to a tree (third-person singular simple present nails Jell-O to a tree, present participle nailing Jell-O to a tree, simple past and past participle nailed Jell-O to a tree) (US, slang, rare) To do something that is impossible or very difficult, with connotations of pointlessness. ==== Usage notes ==== Also used in the common variant to a wall, and with jello in place of Jell-O. British form uses jelly instead. Particularly used in the form like nailing jello to a wall. ==== See also ==== Thesaurus:difficult