Top definition
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.
by Wizards Sleeve August 08, 2006
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