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1.
When you are fucking a girl and when you are about to cum, pull out, tell the girl to spin like a top, and you leave a nice trail around her waist. Experts can attempt the prime meridian or the tropic of breast cancer.
I almost pulled off an equator but the girl didn't spin fast enough.
by equatorbator April 24, 2006
 
2.
When a Tan Line on a pen15 seperates both halves of the Penor. For example one half is tan the other is Albino white.
"Dude that guy's equator was so embarassing"
by BlackDogz February 16, 2009
 
3.
The incorrect spelling of Ecuador
That idiot spelled Ecuador,Equator, on his report 18 times, therefore he failed
by lol February 15, 2005