same as yogurt tube
Does that mean you're back riding that yoghurt tube?
As a male, to masturbate to an ejaculatory climax.
"Yo, That girl is very attractive."
"I fully agree. For that girl, I'd gladly spill yoghurt."
Nasty yoghurt abbreviated to NY is teenage slang to convey disgust or something irkesome and convey a general sense of annoyance.
He is such a liar NY (nasty yoghurt)