"in a state of desire; in a state of imagination; heated with the notion of some enjoyment; longing" [Johnson], c. 1400, perhaps from Old French en gogues "in jest, good humor, joyfulness," from gogue "fun," which is of unknown origin.
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Definitions of agog from WordNet
agog (adj.)
highly excited by eagerness, curiosity, etc.;
I've been agog all afternoon, waiting for the next episode in your mystery story
