barmy

Short definition from Wiktionary

Adjective

1. 1
   Containing, covered with, or pertaining to barm (“foam rising upon beer or other malt liquors when fermenting, used as leaven in brewing and making bread”).
2. 2
   Bubbling with activity or excitement; active, excited.
3. 3
   Crazy, mad; also, eccentric, odd, strange.
4. 4
   Very foolish.

Noun

1. 1
   plural of barma (“a regal Russian mantle or neckpiece made of gold, encrusted with diamonds and other gems”)