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
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