Green’s Dictionary of Slang

wig v.1

[fig. uses of wig n.2 (4)]

1. [1930s+] (US) to talk, to chatter.

2. [1950s] (US black) to inform, to explain to someone.

3. [1930s+] to annoy, to irritate, to render someone nervous.

4. [1950s] (US black) to delight, to impress.

5. [1950s] to understand, to approve.

6. [1950s+] (US) to play cerebral, intellectual jazz music.

7. [1950s+] (US) to be in good spirits, to enjoy.

8. [1950s+] (US) to become nervous, hysterical, overly stressed, mentally unbalanced.

9. [1960s+] (US) to reach a different state through drugs.

In phrases

wig out (v.)

1. [1950s+] (US, also whig out) to lose control, to have a breakdown; thus wigged (out) adj.

2. [1950s+] (orig. jazz) to enjoy oneself, to lose one’s inhibitions, to be thrilled by.

3. [1960s+] (US campus) to shock, thrill or amaze someone, whether positively or negatively.