From Wiktionary, the free dictionary
From spam + -ation.
spammation (uncountable)
- (slang) The act of spamming; a body of spam text
2011, Rob Beschizza, “No URL shorteners in the comments, please”, in Boing Boing[1], pages:URL shorteners' popularity with spammers means we've blocked some of the big ones (at least temporarily) to cut down on the spammation.