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1.
To crack corn means to insult somebody.A crack fight is an insult contest, usually involving 'yo mama' jokes.
"Sticks and stones can break my bones but names can never hurt me;Jimmy crack corn and I don't care"
by Ortolan February 23, 2010
 
2.
Inserting corn into a female's (or male) anus,

leaving it until its about to come out, take a picture and there your have Crack Corn
Damn James i was online and saw Adams picture,

Yer it was off his girlfriends CRACK CORN
by jizzyJames April 30, 2009
 
3.
(verb) The breaking of corn in the cornfield, usually done in the evening. Around dusk.
Jimmy crack corn and I don't care
by LizzayJay March 28, 2009
 
4.
The act of taking a dump. Using the restroom to take a shit.
I went to the bathroom to crack corn.
by King Corn Cracker May 26, 2009