From UgandaWiki: The Uganda Online Encyclopedia
From UgandaWiki, the Uganda online encyclopedia
Ugandan discussions is a euphemism for sexual intercourse. The phrase did not originate from Uganda and it is not widely used, or even known, in the country. It is primarily British slang.
- Discuss Uganda
- Discuss Uganda relations
- Discuss Uganda affairs
There are different theories about the origin of the phrase including:
- A euphemism coined in the 1970s by the British satirical magazine Private Eye. It has become one of the magazine's long-running jokes and is said to stem from a party at which a female journalist was alleged to have explained an upstairs sexual encounter by saying "We were discussing Uganda." (Idi Amin's regime was in the news at the time.) The term "Uganda Affairs" is also derived from this source." 
- A journalistic euphemism for sexual-intercourse, usually illicit, coined by the satirical magazine Private Eye when dictator Idi Amin Dada (1971-1979) accused one of his ministers, Princess Elizabeth, of having-sex in a bathroom while on a diplomatric mission to Europe.
- Former President Idi Amin accused one of his ambassadors of "discussing Uganda" in a bathroom at an airport before sacking her. This version doesn't state whether Amin coined the phrase, or it was already in use.
- Apparently, Nigel Rees, in his book "Phrases & Sayings" attributes the origin of the phrase to a one James Fenton, following an encounter between a Ugandan man and an Irish woman at a party organised by Neil and Corinna Ascherson. The Ugandan was only described as "a former cabinet colleague of President Obote", "a one-legged former minister in President Obote's government", "the much-loved chairman of the Uganda Electricity Board, also of the Uganda Red Cross, and an exile for seven years from the tyranny of Idi Amin." The other party to the "discussions" is said to have been "Irish moralist" Mary Kenny. The incident is said to have happened in March 1973 or slightly earlier.