Grooving or Groovy is now used to express a good feeling.
Lot of these expressions such as Rocking, Rolling, Rocking and Rolling, Digging, Beating it, and Creaming are just a few sexual expressions used by early jazz musicians to compliment a fellow musician.
Man you where Grooving on those drums last night!
I see why you are smiling; you and that girl was Grooving all night
Hey, I can’t do wrong I’m in the Groove!