If we assume all pre-1800ish mentions of 'fuck' are definitely meant to be 'suck', it still features much more prominently in the corpus beforehand than after.
Any ideas why that might be? E.g. certain types of text that were more common before that era, or other (less, er, 'suck'y) types of text that came after, 'diluting' the corpus?
Potentially even more awesome is that they have the entire dataset available for download o_O
edit: case sensitivity is more fun than insensitivity: http://ngrams.googlelabs.com/graph?content=Star+Trek%2Cstar+... vs http://ngrams.googlelabs.com/graph?content=star+trek%2CStar+...
edit2: there are a whole bunch of geek-term bumps around and just after 1900. Anyone know why? E.g.: http://ngrams.googlelabs.com/graph?content=Star+Wars&yea...
http://ngrams.googlelabs.com/graph?content=smartphone&ye...
(Actually, "internet" also has a similar spike. I suspect some books are mislabeled in their dates.)
Perhaps weirder, "Woot": http://ngrams.googlelabs.com/graph?content=Woot&year_sta...
http://ngrams.googlelabs.com/graph?content=liberty&year_...