Of a person: carried away by or filled with enthusiasm or desire; wildly excited; infatuated. With about, after, for, †of, on (chiefly British), over…

Of persons: Violently excited. Passionately or excitedly desirous to do something. Also const. for.

Of persons: Violently excited. Elated, enthusiastic, ‘raving’. Also †const. after.

Of unsound mind; insane, mad, demented, ‘cracked’. Often used by way of exaggeration in sense: Distracted or ‘mad’ with excitement, vehement…

Affected by intense feelings of love or attraction for someone; infatuated, besotted, love-struck. Also (occasionally): obsessed with or very…

Extravagantly enthusiastic; infatuated.

With about, on, over, etc. Having or manifesting a passion for or obsession with someone or something; mad on, wildly excited about. Cf. bug, n.2 4a.

colloquial (originally and chiefly U.S.). With about, on, over, etc. Having a passion for or obsession with; mad on, wildly excited about. Cf. bugs…

Of a person: having undergone a change in opinion, outlook, interest, etc., which is held or practised extremely enthusiastically or over-zealously.

Mad, crazy; (in weakened sense) eccentric, unconventional, wild; (also) extremely enthusiastic.