fixed handle; username (on anonymous forums)
Abbreviation of 固定ハンドル. Refers to a persistent username used on forums like 2ch where most users post anonymously. Internet slang.
See also: 固定ハンドル
On that thread, a user with a fixed handle is trolling.
user with a fixed handle; namefag
By extension, refers to the person who uses a fixed handle instead of posting anonymously. The gloss 'namefag' is a vulgar English internet slang term; use with caution. Internet slang.
See also: 固定ハンドル
Users with fixed handles risk having their personal information exposed quickly.