Board Op: Standing by.
Stage Manager: LX34 go.
Board Op (after the cue's fade time is over): Complete.
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.
Lx", random post to a friend on Facebook that is both meaningless and dim-wittingly pointless.