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.
PHRASAL VERB: V P, V n P, be V-ed P, also V P n (not pron)