Get (one's) rocks off vulgar slang
In meaning 1, "rocks" refers to testicles.
To reach the highest point of sexual pleasure.
As soon as he got his rocks off, he left her. I can tell that he just considers her a fuck puppet.
Watching too much porn, he now has difficulty getting his rocks off when making out with his wife.
To be happy and get enjoyment from something or in doing something.
A lot of people claim that they've got their rocks off watching this film.
I really get my rocks off on my work. Both the boss and my colleagues are supportive and tender-hearted.
To ejaculate
The verb "get" must be conjugated according to its tense.
This slang originated in US and dates from 1940s.
To be thankful or grateful for one's good luck usually while avoiding a bad situation
You should count your lucky stars as you managed to avoid that violent car accident.