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A slang term for a solid block of cocaine, often mistaken for salt. It is highly dangerous among daily use, because many kids with severe mental issues mistake it for salt.
Ex) The mentally challenged child who had a learning disability fucked up his brain by hitting a line of rock salt.
rock salt by Cakelover123 August 6, 2014

Coney Island Rock Salt 

Coined by a local hobo overheard during WABC7NY coverage of the 1993 failure of the Sonic the Hedgehog Macy's Thanksgiving Day Parade balloon, this appears to be a term related to what the man was smoking out of his crystal meth pipe when he saw the balloon deflate.
"Jeepers creepers! I gotta stop blazing this Coney Island Rock Salt! It looks like that big fucking balloon is coming right towards me!"
the harded sperm on a rag used to pleasure ones self
the sock was coverd in salt rocks from last night after having fun with him self
salt rock by Cole Train December 28, 2005
Salt Rock, when you dick is very hard and when you have a sexual intercourse the vagina feels like salt.
Her pussy was like a salt rock.
Salt Rock by FagPuffisFun May 21, 2019

Ralgex and rocksalt 

The very worst sexual feeling one can experience. Describes a very unpleasant penetrative fuck.

Ralgex is a warming muscle rub sold in the UK and rocksalt is just gritty and nasty. Anyone who feels like this in the ass or pussy is plain horrid and probably diseased, or an overbanged ho.
Dude 1: "How was your date last night, Dawg?"
Dude 2: "She looked fine but felt like Ralgex and rocksalt when she took it up the marmite motorway* my man!"

* Hershey Highway for American readers.