She left her husband and ran off with some young 'stud'.
retired racehorses being used as 'studs'
a horse that has been 'put out to stud'
(..) ...let's make it look like it does in the instructions! -by- macaroni flying in. Here's one. Guys, got a -by- with an indented stud on one side. - Cheese slopes. Come on, everybody. - Roger that, Roger. Can I get a couple LURPs over here? - Thanks, Gail. (..)2014 The Lego Movie