Short form cl. Common term used among barkeepers with central europen background and people mixing drinks. Often confused with centi litres, which is a the measurement form for liquids. One litre is one hundret centi litres.
Clit litre is a slang term for any amount of alcohol beverages, be it centi litre, milli litre or litre. Barkeekers use this term interchangable to confuse people. They're assholes.
"Mix it with 2 clit litres of Xuxu!"
"0,33 cl Beer"
Means 0,33 litres.