Green’s Dictionary of Slang

John Selwyn n.

[rhy. sl.; ult. UK Conservative politician John Selwyn Gummer (b.1939)]

1. an unpleasant reaction to drugs [= bummer n.4 (1)].

[UK]R. Puxley Fresh Rabbit.

2. any unpleasant experience or person [= bummer n.3 (3)].

[UK]R. Puxley Fresh Rabbit.