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1.
When a guy lays down and his balls cover his ass-hole.
Jen: Mark, your balls are so big that there is an anal eclipse tonight!
by I_M_Stuipd May 02, 2010
 
2.
When your butthole consumes itself
I took a fat shit and my butthole caved in, I had an anal eclipse.
by andrew.d October 01, 2007