The phrase "envelope snafu" refers to a mistake or problem that happens with an envelope. It suggests that something went wrong or there was a mix-up with the envelope, causing confusion or difficulty in a situation. Full definition
An upset might still be brewing — as last year's epic envelope snafu reminds us, anything can happen — but any other outcome would have to be reckoned a major surprise. (southflorida.com)
The previous day, celebrity presenters had gathered in the auditorium to run though the show, and to ensure there wouldn't be another Best Picture envelope snafu, like last year's debacle. (independent.ie)
And Jimmy Kimmel starts, of course, by acknowledging last year's epic envelope snafu: «This year, when you hear your name called, do not get up right away.» (southflorida.com)