Quid is a slang expression for the British pound sterling, or the British pound (GBP), the currency of the United Kingdom (U.K.).A quid equals 100 pence and is believed to come from the Latin phrase “quid pro quo,” meaning "something for something."The origins of this term are unclear, but it is thought to have first been used in print in 1864.Quid has been used as a slang term for money in other countries, such as Australia and New Zealand.