Vitriolic argument or ranting, especially via email or in postings to a newsgroup; the action or practice of sending inflammatory, emotive, or abusive email messages.
Origin
1980s. From flame + -age. Compare flaming.
Definition of flamage in US English:
flamage
(also flameage)
nounˈfleɪmɪdʒ
Computing slang
Vitriolic argument or ranting, especially via email or in postings to a newsgroup; the action or practice of sending inflammatory, emotive, or abusive email messages.