John Cantelo
Well-known member
Good to see an article in the latest edition of 'British Birds' (May 2018 Vol 111 p264-274) confirming that the birding term 'jizz' was first published by T A Coward in 1921 who heard it from an unidentified Irishman. They debunk the suggestion that it comes from the military term GIS/GISS - general impression and shape/general impression size and shape - which appears to be without foundation. Despite looking for references and asking relevant authorities they could find evidence that this term was ever used. They also unearth the fact that "jizz" was used in Ireland as early as 1900 as meaning "spirit" or "liveliness" which seems telling to me and the extension as it applies to bird ID a reasonable one (although they're less enthusiastic).