More thoughts: 'to be high' usually implies a drug-induced intoxication, but not alcohol. 'to be on a high' is more often a state of euphoria or intoxication through excitement.

I agree this expression using the F****** word is classified as swearing & in some English countries you can be arrested for indecent language, so take care.

Hi Juliana Usually yes, but it does not have to be drugs. It can also describe a feeling of extreme excitement, like the adrenaline rush you experience when doing something dangerous. Not a polite expression though – don’t say this to your grandmother!