To hinder the ability of a friend or associate to engage romantically with strangers by wearing the unfashionably foam shoes called "Crocs," thereby conferring the aura of a friend-of-Croc-wearers to said friend or associate.
Noun form is a "Croc-blocker;" One who Croc-blocks others.
Also see: Cock-blocking,
Friend 1: "Damn man, Brett has really got to stop wearing Crocs... I can't pickup any chicks around him."
Friend 2: "Yea man that stinks, he is totally Croc-Blocking you"
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