godan verb (-ru), intransitive verb
fall through; flop; fizzle out
Colloquial intransitive verb used when a plan, project, event, or deal fails to materialize or collapses before completion. Often implies an informal or disappointing end.
旅行の計画がポシャった。
Our travel plans fell through.
あのプロジェクトは結局ポシャったらしいよ。
I heard that project ended up flopping.