Mine and Yours
Terms used by floor traders to signify buying and selling. Mainly used in forex transactions.
Investopedia Commentary
If a trader wanted to buy something, he/she would type or say "Mine," as in "It's mine." If the trader wanted to sell, he/she would type or say "Yours," as in "It's yours."
Related Links
The Nitty-Gritty Of Executing A Trade
Getting to Know Stock Exchanges
Getting Started In Forex
A Primer On The Forex Market
See also: Buy, Exchange, Floor Trader - FT, Forex, Sell