punk out v.
1. [1920s+] (US, also punk) to display cowardice.
2. [1960s+] (US prison) to submit to homosexual anal intercourse.
3. see punk v. (6)
1. [1980s] (US campus) furious.
2. [1980s] describing someone who has been forced to submit to anal penetration.
3. [1980s] in fig. use of sense 2, made to look like a coward; to disrespect.