In theatre, an initialism for "Lights." Typically called by the stage manager with a number denoting the cue number to be executed by the lighting board op.

Pretty much the "fetch" in Mean Girls in replacement of "xo" or something else slightly more normal (despite however much cringe-worthy).

Basically what dweebs say because they're trying to make up a new abbreviation that will never be cool because,

a) They're the only ones saying it.
b) No one knows what it means.

Text-messaging abbreviation for "linguistics".

a total failure in life

LX = Alex

losers X-travaganza

To love someone or something x much, where x can be any quantity.