The meaning of stag has Stag: A slang term for short-term speculator. A stag would be equivalent to a day trader who attempts to profit off short-term market moves by quickly moving in and out of positions. (Investopedia, http://www.investopedia.com/terms/s/stag.asp)   A person who applies for an allocation of shares in a joint-stock concern solely with a view to selling immediately at a profit. Or 1854 H. AYRES Fenn’s Eng. & For. Funds 109 A Stag is one who is not a Member of the Stock Exchange, but deals outside, and is sometimes called an ‘Outsider’ 329