Canadian origin - especially Ontario and Nova Scotia where government run liquor retailers are called the L.C.B.O (Liquor Control Board of Ontario) and N.S.L.C (Nova Scotia Liquor Commission) respectively.
Found in the Sloan song Underwhelmed -
She is obviously a person with a cause
I told her that I don't smoke or drink
She told me to loosen up on her way to the L.C.
An initialism often used as a noun to describe someone who needs liquid courage to have any wheels, or to make move on any girl.
"Of course your date went sour, you should have ordered some wine, you're such an LC."
"Louis has some pretty awesome stories about having sex with girls but he's shit at talking to girls in real life, we all know he's a classic case of LC."
"Wow, what an LC!"