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.
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.
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!"