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1.
It means that something has been done or said so many times, the count is infinite
Child: Grandma, can I buy some ice cream from the ice cream truck?

Grandma: Chile, I've told you fifty-eleven times I don't have any money for you to be wastin on that ice cream truck.
by Ms. Peaches May 26, 2004
 
2.
An imaginary number, signifying something innumerable or a number that is too large to count. Often used as hyperbole, or an extreme exaggeration.

Syn: countless, infinite, myriad
I asked her out like fiftyeleven times and she says no every time.
by Chrissstopher February 04, 2005
 
3.
It could be defined as 65, but the true meaning is a very large quantity of something.
"There are fifty-eleven mosquitos in my tent!"
"Wendy's bithday party had fifty-eleven guests!"
"I want to have fifty-eleven friends when I grow up!"
by whendj February 03, 2010