A slush fund (also black fund), colloquially, is an auxiliary monetary account or a reserve fund. However, in the context of corrupt dealings, such as those by governments or large corporations, a slush fund can have particular connotations of illegality, illegitimacy, or secrecy in regard to the source of the funds or how they were acquired or for what purposes they were used. Funds are usually made to discreetly pay influential people in return for preferential treatment, advance information (for example, to acquire non-public information in financial transactions) or some other service.
Political dealings with slush funds tend to create suspicions of quid pro quo (buying political favors), and can be viewed on the surface as corrupt and subversive of the democratic process. For example, Richard Nixon's "Checkers speech" of 1952 was a successful effort to dispel a scandal concerning a rumored slush fund of campaign contributions. Years later Nixon's campaign did use slush funds to buy the silence of the "White House Plumbers".
A slush fund can also be connected to amateur level athletics. In the past fifty years, there have been multiple occurrences where boosters and supporters of a collegiate sport program provide the school and coaches with extra money. This money is then distributed to a number of athletes in order to compensate them for their participation and commitment to their program.
Some of the most memorable scandals that involved slush funds with college athletics occurred at Southern Methodist University in 1986 and the University of Michigan in the 1990s. Southern Methodist's football team was caught receiving money from the school which was being funded by one of the boosters. The University of Michigan had one booster paying several of the men's basketball players, including NBA superstar Chris Webber.