freak_out
1. [ verb ] lose one's nerve
Synonyms: lose_control gross_out freak
Examples:

"When he saw the accident, he freaked out"

Related terms: panic
2. [ noun ] (psychology) a wild delusion (especially one induced by a hallucinogenic drug)
Synonyms: disorientation
Related terms: delusion
Similar spelling:   freeze_out
  frock_coat