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1.
To put ice in one's beverage, used mostly with drinks containing liquor.
Hey Tony! Get me a Corona on the rocks!
by Mercy Fucking Bell August 24, 2004
 
2.
poured over ice (usually said of liquor)
I think I'll a scotch on the rocks.
by Light Joker October 21, 2005
 
3.
Describing a drink, usually containing alcohol, with ice in it.
I'll have a vodka on the rocks.
by Heart Arcade August 07, 2005
 
4.
1. in a ruined condition

2. poured over ice(usually said of alcoholic beverages)
The global economy may be on the rocks, but that does not seem to have stopped anyone from enjoying a scotch on the rocks.
by The Return of Light Joker March 09, 2009
 
5.
Hard or erect. Generally used in reference to the penis.
Dr: It appears this mans penis is only 3.2 inches long.
Nurse: On the rock Doctor?
Dr: I'm afraid so.

by Scoot123 January 30, 2008
 
6.
When a marriage is going to run aground like a boat on a foggy reef..
Shaz's marriage was on the rocks due to her insensitivity to her husbands foot odor and halitosis.
by Blue Cawdrey November 23, 2004
 
7.
Somebody high on crack cocaine
I'm not sure how that guy is supposed to be served..
But I sure like Vodka "on the rocks" better.
by Altti Kuronen February 09, 2008