Definition

An acronym standing for "Life's a Bitch," deployed when the universe decides to pile on the misery with impressive efficiency. It's the fatalistic shorthand for when someone's day goes from bad to catastrophic and there's nothing left to say except acknowledge that existence is occasionally cruel. The verbal equivalent of a shoulder shrug in the face of cosmic injustice.

Example Usage

My car broke down, I got fired, and my dog ate my lunch. L.A.B., I guess.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=L.A.B.&defid=397497)