I am sure rec should be a swear word. It has that harsh sound to it.
Usage:
"Why don't you just rec off!"
"You are such a stupid rec."
"I think he is a reccing idiot."
P.S. A swear word is only a swear word based on context. Considering that rec in this post is in the context of a swear word, the mods can censor this post if they want.