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
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