What does "freakout" mean?

A frightening or disorientating experience, especially one that results from the use of a hallucinogenic drug.

Freakout

noun, slang

noun, slang ·Uncommon ·College level

Noun

1
A frightening or disorientating experience, especially one that results from the use of a hallucinogenic drug. slang
2
An occurrence of unrestrained or irrational behaviour. slang

From freak + out, as a deverbal from freak out.