What does "last minute" mean?

An arbitrary (non-specific) point in time, too close to a deadline to reasonably begin a critical task.

Last minute

Common synonyms include: belatedness, cursory, deathbed, eleventh hour, eleventh hour, eleventh-hour.

adj, noun

adj, noun ·Rare ·Advanced level

Noun

1
An arbitrary (non-specific) point in time, too close to a deadline to reasonably begin a critical task. idiomatic
"I like to do everything at the last minute. It does tend to make me late for things, though."
2
the latest possible moment wordnet

Adjective

1
Very close to a deadline. idiomatic
"That last minute revision really paid off in the exam!"

"I like to do everything at the last minute. It does tend to make me late for things, though."