Its an alternative meaning of Hootenanny - not a party but a Thingummygig
hence Doobery
I remember now that Kenny Everett used the term
hoot·en·an·ny (htn-n)
n. pl. hoot·en·an·nies
1. An informal performance by folk singers, typically with participation by the audience.
2. Informal An unidentified or unidentifiable gadget.