Definition of to freak out in English English dictionary
To react (or cause to react) with extreme anger or fear to something to the extent that one loses one's composure or behaves irrationally; originally, to suffer an unexpected and severe bad reaction from the recreational use of a psychotropic - usually hallucinogenic - drug
Jimmy'll come in off the road, you won't be there, he'll freak out and call you a hundred thousand times.
If someone freaks out, or if something freaks them out, they suddenly feel extremely surprised, upset, angry, or confused. I remember the first time I went onstage. I freaked out completely I think our music freaks people out sometimes It sort of frightens me. I guess I am kind of freaked out by it