First fail is when a person posting a comment on a website posts the word "first", but actually misses first place because someone else posts a more meaningful comment a split second before them.
Blog Comments:
someperson: nice blog. thanks for the post, very informative.
firstfailperson: FIRST!!!!!!!!!
anotherperson: lol, first fail.
by thewack October 23, 2009
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A first-class fail is a euphemistic term for failing a paper with the highest possible failure grade.

If you needed a C- to pass, for example, then receiving a D+ would count as a "first-class fail".
How did you go on your biology assignment?
I got a first-class fail
by K.C.J. May 4, 2010
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If a girl doesn't break her hymen in their first sexual experience, leaving the girl a virgin. While the male lost his.

This usually happens when the guy has a small dick, and break the hymen
Girl: I don't feel anything
Boy: It's so good

Boy: Wait, you didn't feel anything

Girl: yea, I think that means i failed first
by AbbuTheWuvly June 2, 2018
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