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1.
To menstruate.
"Hey Frannie, want to go roller-blading?"
"Hell no, I'm Cracking an Egg"
by PopeMichael February 09, 2010
 
2.
Just before orgasm, a man slaps his dick on his partner, then cums on that spot. the partner should get the feel that he cracked an egg on them.
Last night, i was Cracking an Egg on his/her face.
by I am... Steel Man? March 27, 2011