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1.
When you go out in a group and one of your friends wears crocs, thereby preventing anyone in the group from getting tail.
"Omg, I can't believe you let her go out in those tonight. Total Croc block."
by Srizie January 25, 2009
 
2.
When someone stops or prevents another person from buying or wearing crocs shoes.
"Man, I really wanted those crocs shoes, but Bill got in my way. He is such a croc block."
by juliman November 05, 2012
 
3.
When a male is assumed to be a homosexual due to the presence of crocs on ones feet.
i asked her if she wanted to go have sex. she replied with a gang of laughter and the words ' croc block ' and asked me if i wanted to go shopping instead.
by Joel dontfuckwiththebuck October 27, 2010