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1.
a colloquial term for "breasts"
Have you seen that girl in the green dress by the bar? Man, has she got some lovely nyub-nyubs!
by The Notorious P.I.G. May 15, 2012
 
2.
When a cat wants food, it is said to 'nyub nyub' around until its owner gets suspicous of its nyubnyubying and feeds it.
The cat had to nyub nyub around before being fed
by francesoingarian November 11, 2011